[jweather]

It's called Ableton Live... they didn't invent the idea, but they're easily the most popular software for building and playing layered loops.

Lots of artistry goes into authoring the loops themselves before you ever get to the point of sequencing them into a song. The Adventure Machine lets you enjoy the fruits of Madeon's work in building some loops that work together well.

[mrdassani]

Ableton Live is not intuitive (personal experience), nor is it freely available on the web like this is, which is what I was trying to get at (but missed mentioning).

[sydlawrence]

what jweather says. we've not made the first looper... however, have considered launching it as a tool for people to add their own audio loops to... maybe one day...