Here's video 1 of my Ableton Live 9 Beta series which shows how to use the different Convert Audio to MIDI features in a creative way to start a song or track. This one is about the 'Convert Drums to MIDI' function and how you can utilise it to get a starting point in recording music, e.g. with a track by Aphex Twin as in this case.
Any questions or comments? :)
Check out the other tutorials in the series.