Using linear optimization to calculate movement of pong paddles based on the rhythm of music so that each beat lies on a ball hit. Brilliant idea. https://www.cvxpy.org/ is a python library for modeling convex optimization problem.

A music keyboard that creates consonants for you automatically.

Trim a piece of music to a specified length, or edit it by specifying the sections to avoid, prefer, or repeated. Let the tool find out how to make the cut and make transit natural.

It works algorithmically (i.e. not using an AI) and computation is done locally on the browser. However, the file you submitted will be uploaded to server and kept indefinitely, which is concerning - be aware.

A small webpage tool to play with instrumental music. Synthesizer, composer, sequencer.

Here's a more powerful one: https://hidden-realm.github.io/cardboardbox, it has additional features like customizing harmonics.

A type of music composer that is based on calculating each the amplitude of a wave based on an expression at each time step. It's pretty amazing how complex the melody can be from some of the very simple expressions.

An interesting article on why there is half megabytes of empty bytes in every music file.

The music you hear is generated in your browser by a randomised algorithm, below you can see the notes and parameters that are currently in use. You can also interact with various parameters and buttons manually.

Sound effects and melodies offered in permissive licenses.

funkwhale author's funkwhale pod, contains plenty of cc0/free music

<blockquote>Index of free Classical Music downloads on the internet. Sorted by composer and work.</blockquote>

<blockquote>BeepBox is an online tool for sketching and sharing instrumental melodies.</blockquote>

Great for making in-game sound effects and 8-bit bgm.

<blockquote>We're on a mission to build the biggest and most comprehensive music database and marketplace. Imagine a site with discographies of all labels, all artists, all cross-referenced, and an international marketplace built off of that database.</blockquote>