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ABC notation is a text-based music notation system: you write a tune as plain letters and symbols in a file, and software turns it into readable sheet music or a playable MIDI file. It is the de facto standard for folk and traditional music, and abcnotation.com alone offers access to around 800,000 tunes as free sheet music or MIDI sound files. It suits anyone who wants to share, search, or archive tunes without a score editor — especially players of traditional, folk, and session music.

Why a text format works for music

Most notation software stores music in a binary or proprietary format that is hard to paste into an email. ABC stores everything as characters, so a whole tune fits in a message, a forum post, or a web page. That is the main reason it spread through folk and traditional communities: a jig or reel can be typed out, corrected, and passed along in seconds.

The site describes the format as concise and text-based, making it easy to share tunes via email or on websites. It also notes that ABC is popular worldwide, particularly for folk and traditional music, with a large proportion of tunes from Irish, Scottish, and other Celtic sources, plus music from America, England, France, Scandinavia, Europe, and a sizeable collection of Chinese music.

How a tune is written

An ABC tune is a header block followed by the notes. The header uses single-letter fields. Here is the well-known tune "Speed the Plough" as given on the site:

X:1
T:Speed the Plough
M:4/4
C:Trad.
K:G
|:GABc dedB|dedB dedB|c2ec B2dB|c2A2 A2BA|
GABc dedB|dedB dedB|c2ec B2dB|A2F2 G4:|
|:g2gf gdBd|g2f2 e2d2|c2ec B2dB|c2A2 A2df|
g2gf g2Bd|g2f2 e2d2|c2ec B2dB|A2F2 G4:|

Reading the fields:

In the note lines, letters A–G are pitches, | marks bar lines, : marks repeats, and digits change note length — c2 is a note held twice as long as a plain c. Uppercase and lowercase letters sit in different octaves. After processing, a typical result is a normal staff score.

Finding tunes and converting them

The site's search box accepts queries and offers an advanced search plus help. You can browse a top-10 list of tunes (for example "O Then Dearest Helen", "Kalinka", and "Greensleeves") and search by title or in A–Z file order.

To turn ABC text into something you can read or hear:

1. Copy the ABC text of a tune.
2. Paste it into any ABC-compatible program or web converter.
3. Expect two common outputs: rendered sheet music (staff notation) and a MIDI sound file you can play back.

The site points to plenty of free software for Windows, Mac, Linux, and mobile to transfer ABC into scores or MIDI. It also notes specialist software that can generate tablature and fingering charts for guitar, mandolin, banjo, and other fretted stringed instruments, fiddle/violin/viola, diatonic accordion, trumpet, horn, euphonium, tuba, harmonica, and drums.

Common uses

• Sharing by email or on a website — the format's whole advantage; no attachments needed.
• Session tunes and band repertoires — collect and swap sets as text.
• Historical collections — the site hosts online versions of well-known collections such as O'Neill's Music of Ireland, Playford's English Dancing Master, and tunes by Carolan.
• Instrument-specific charts — generate tab or fingering diagrams for the instruments listed above.
• Original music — write and distribute your own tunes in the same format.

Getting started

The site's quick links include "How to ... get started with abc", "understand abc ... basics", and "understand abc ... next", alongside examples, tutorials, a blog, and discussion forums. It also notes seven "How to ... with abc notation" videos. A practical path: read the basics page, take one tune from the top-10 list, paste it into a converter, and compare the text against the rendered score until the fields and note conventions feel familiar.

A free hosted REST API like ReqRes gives you a real HTTP endpoint you can call immediately—no signup, no local server, no database setup. You get predictable JSON responses for users, resources, login, and registration, which makes it useful for front-end demos, integration tests, learning HTTP clients, and prototyping. What it is not is a production backend for your app: the data is shared, resets periodically, and you don't control the schema. If you need persistent, private data with auth and logs, that's where an account-based backend or a commercial licence comes in.

What "free REST API for testing and prototyping" actually means

The phrase sounds vague, so it helps to separate two things people often conflate:

• A mock/sample API — a public, hosted service with fixed or semi-fixed endpoints that return realistic-looking JSON. You don't own the data. It exists so you can point code at a URL and get a response.
• A real backend you configure — a service where you define collections, schemas, authentication, and logging, and where your data persists and belongs to you.

ReqRes's landing page describes both: a free REST API for testing and prototyping with real responses and no signup, plus an option to build your own backend with collections, auth, and logs at app.reqres.in. Those are different products with different trade-offs. The free public endpoints are the "point and go" part; the account-based backend is the "own your data" part.

What you can do with the no-signup public endpoints

1. Front-end demos without a backend

If you're building a UI and need data to render, you can fetch from a public endpoint instead of hardcoding arrays. This keeps your demo code closer to real fetch logic:

async function loadUsers(page = 1) {
  const res = await fetch(`https://reqres.in/api/users?page=${page}`);
  if (!res.ok) throw new Error(`HTTP ${res.status}`);
  const { data, total, page: current } = await res.json();
  return { users: data, total, page: current };
}

You get pagination fields, a data array, and support metadata—enough to build list views, loading states, and empty states.

2. Integration and contract tests

You can assert that your HTTP layer handles status codes, headers, and JSON shapes correctly. Typical checks:

• GET /api/users/2 returns 200 with a data object.
• GET /api/users/23 returns 404 (a non-existent user).
• POST /api/login with valid credentials returns a token; with missing fields returns 400.

This is useful for testing your client wrapper, retry logic, error handling, and serialization—without spinning up your own server.

3. Learning HTTP clients and tooling

If you're new to fetch, Axios, curl, Postman, or HTTPie, a hosted API is a low-friction target. You can practice:

• Sending query parameters (?page=2, ?delay=3).
• Setting headers and reading response headers.
• Handling POST, PUT, PATCH, DELETE.
• Observing status codes for success and failure.

4. Deliberate failure and latency testing

Endpoints that return 404 on purpose, or that accept a delay parameter, let you test how your app behaves when things go wrong or slow down. That's hard to do reliably against a happy-path local mock.

What the public endpoints are not good for

The key limitation: you don't own the data, and other people are hitting the same endpoints. Treat responses as illustrative, not authoritative.

When you'd move to an account-based backend

Consider app.reqres.in (collections, auth, logs) when any of these are true:

• You need your own collections and fields, not the fixed demo schema.
• You need data to persist between sessions and belong only to you.
• You need real authentication flows you can rely on in a demo or internal tool.
• You need request logs to debug what your client actually sent.
• You're working with a team and need shared, stable endpoints.

The trade-off is setup and, eventually, cost. The public endpoints require none; the backend requires an account and configuration.

Where pricing and licensing become relevant

The site signals a commercial licence and an upgrade path (with Stripe as the payment platform), but specific prices, plan tiers, and limits aren't stated here—so don't assume numbers. What you can reason about:

• Prototyping and learning → free public endpoints are usually enough.
• Internal tools, demos for clients, or anything you don't want reset → an account-based backend is the natural next step.
• Production or commercial use → check the licence terms and any paid plan, because "free for testing" and "free for commercial production" are not the same thing.

Before committing, read the current terms on the site rather than relying on secondhand summaries, since pricing and licence scope change.

A quick decision checklist

1. Do you need data that persists and is private? If yes → account-based backend.
2. Do you need a custom schema? If yes → account-based backend.
3. Are you only testing HTTP behavior, UI rendering, or learning a client? If yes → free public endpoints.
4. Will this touch real users or revenue? If yes → review the licence and any paid plan first.
5. Do you need logs and team access? If yes → account-based backend.

If you answer "no" to 1, 2, 4, and 5, the free hosted API is likely all you need. If you answer "yes" to any of them, plan for the account-based path.

iHeart is a free streaming platform that combines live radio stations, customizable artist stations, playlists, and podcasts in one place. You can start listening without paying by opening iheart.com in a browser or using the iHeart app, then searching for a station, artist, song, or podcast. A subscription is only relevant for certain premium features; the core listening experience described on iHeart's site is available for free.

What you can listen to on iHeart

iHeart organizes its content into a few main types, and knowing the difference helps you find what you want faster.

The key distinction is live versus on-demand. Live radio plays whatever is broadcasting right now, so you can't skip tracks. Artist stations and playlists behave more like on-demand listening, where you control the starting point.

How to start listening for free

You can begin on either the web or the app. The steps are similar.

1. Open the platform. Go to iheart.com in a browser, or install the iHeart app on your phone or tablet.
2. Search or browse. Use the search function to enter a station name, artist, song, or podcast. Alternatively, browse categories to see what's available.
3. Select what you want to hear. Choosing a live station starts playback immediately. Choosing an artist creates or opens a station built around that artist.
4. Press play and adjust. Use the player controls to pause, change volume, or move between stations. On live radio, expect no track skipping; on artist stations, you have more control over what plays next.
5. Save what you like. Favoriting a station or artist makes it easier to return to later without searching again.

Expected result: audio begins playing shortly after you select content, and your favorites appear in your account for quick access next time.

Creating your own stations and playlists

• Artist stations: Start from an artist you like, and the station plays music in that style. This is the fastest way to get continuous music without building a list yourself.
• Playlists: Add individual songs to a playlist when you want a specific set of tracks rather than a continuous stream. This suits workouts, commutes, or a fixed party set.
• Tip: Use artist stations for discovery and playlists for control. If a station drifts away from what you want, switch to a playlist instead of fighting the stream.

What's free versus what needs a subscription

iHeart's own description states that its music, podcasts, and radio stations are available for free, and that you can listen to thousands of live stations or create your own artist stations and playlists. The site also references a subscription, which indicates that some features sit behind a paid tier.

Because the exact free-versus-paid split isn't fully detailed in the available information, treat it this way:

• Assume free: live radio stations, artist stations, playlists, podcasts, and general music/news browsing, based on iHeart's stated offering.
• Check before assuming: any feature labeled as premium, ad-free, or subscription-only. If a paywall appears, that specific feature requires payment.
• Don't assume: that a subscription is required to listen at all, or that everything is free. Verify at the point where you're asked to sign up or pay.

Common snags and how to handle them

• A station won't play. Live stations can be unavailable due to regional restrictions or temporary outages. Try another station to confirm whether the issue is the station or your connection.
• You can't skip a track. That's expected on live radio. Switch to an artist station or playlist if you want control.
• Search returns too many results. Add the type of content to your search, such as the artist name plus "station," or search podcasts separately from music.
• You lose your favorites. Sign in to an account so saved stations and playlists persist across sessions and devices.

Quick decision guide

• Want background music with no effort? Open an artist station.
• Want a specific set of songs? Build a playlist.
• Want a live show or local broadcast? Pick a live radio station.
• Want talk or storytelling? Go to podcasts.
• Want to avoid paying? Stick to the free listening options above and check any prompt before entering payment details.