This is exactly what artist, Gregg Gillis, aka Girl Talk has done. On his new album Feed The Animals he takes samples from over 300 different songs, fuses them together, and forms an entirely new song. One of the notable "mashups" includes Jay Z's "roc boys" playing over Radioheads "Paranoid Android."
He is hoping to avoid legal problems under the Creative Commons Licensing act, which allows websites and various media to sample 30 seconds previews.
Will he get sued? I highly doubt it, for one reason specifically: publicity.
Any artist who sued him would be facing an angry mob of music fans. Looking back a few years in history, take the example of Metallica's drummer Lars Ulrich who led the campaign against Napster. He faced a backlash and that was for people stealing entire songs! Imagine if one person gets sued for using no more than 30 seconds of a song. (see also Prince and YouTube)
Anyways, if music 2.0 intrigues you, I encourage you to check out Girl Talk's Feed The Animals. Personally, I give the CD a 9/10, but it is subjective to whether you really like the genre or not.
