Block Band was a rythm game released on Cubecraft (but initially made for a server called “The Chunk”) based on Super Crazy Guitar Maniac Deluxe (was a flash game).

It worked through a website which played and synced the music with what was happening in-game. It featured 24 songs made using a custom editor.

You can read more about it here: https://minikloon.com/blog/posts/byt-canon/