Predicting the next new song

A few interesting questions in the cross of 'big data' and music:
1/ Predicting the next song a -particular- user will like. (e.g. Pandora)
2/ Predicting the next song that will become popular
 Last I heard, Pandora uses analysis of the music itself. But there is so much data out there:
* The singer
* The Lyrics
* Social networking and google mentions
* Radio plays
* The label (is a valid datapoint)