From VHND:

http://www.vhnd.com/2010/07/14/eddie...ezil-zappa-cd/

The fun of it is that you’re actually hearing a lot of these people out of context, they’re playing on things they wouldn’t normally be playing over, and that was part of the fun of making this project happen. So, either people are playing on exactly what you would expect them to play over, or something you would never expect them to play over. The Van Halen thing is pretty funny because I put this section together where I asked Edward to play sort of a “greatest hits” from all his different guitar licks. We just took different licks from different solos from different records and made him play them all and string them together in one guitar solo. That was pretty fun because it was like having your own toy Eddie Van Halen–like, “I’ll make my Eddie Van Halen play this.”