Listen to Wikipedia
Listen to the sound of Wikipedia's recent changes feed. Bells indicate additions and string plucks indicate subtractions. Pitch changes according to the size of the edit; the larger the edit, the deeper the note. Green circles show edits from unregistered contributors, and purple circles mark edits performed by automated bots. You may see announcements for new users as they join the site, punctuated by a string swell. You can welcome him or her by clicking the blue banner and adding a note on their talk page.
This is fantastic. The noise—I hesitate to call it music, but I also hesitate to call it not music—is remarkably consonant. I've just left it running in the background.
What's more: the site is open-source, so you can have a nosey around at how it works. At its core is a websocket connection to a server that Hatnote manages, but which itself pulls from Wikipedia's Recent Changes. Also of note: no build step. Just a couple of vendored libraries in a static/ folder. Take notes, folks.