Two audiovisual Internet Things which have caught my eye and ear lately:

See Hear Party

Provide some keywords for visuals and music. The site returns a stew of animated gifs at a frequency roughly corresponding to the music's rhythm. It's a neat project and plays well with the modern derivations of the glitch aesthetic (I still see the term seapunk from time to time though that's likely archaic now, too). 

The intended result seems to be something like this, though there are other ways to play the game.

tildemash

Youtube contains a wealth of isolated tracks (i.e., just the vocals or the drums) from classic songs. What would they sound like if you picked a few at random and mashed them up? That's how new classics get made, right?