Del is one of my favorite Hip Hop artists. I would love to get his solo work, his stuff with Deltron 3030, and the two songs he did with Gorillaz.
Some of his early solo work features guitar, but most of his other songs don't (though they usually have something that could be charted to guitar). With Rock Band Network on the way, this is no longer a problem though~ since there will be songs that can have any combination of instruments. (which means songs with vocals, bass, and drums are fine if nothing can be charted to guitar)
Even if you're not a fan of Hip Hop~ I must highly recommend the Deltron 3030 album. I find myself going back to it all the time. Plus, it's a concept album~ which I think is really awesome. For his solo material, my favorite album to listen to lately has been Future Development~ though when it comes to songs that would work well in the game his debut is best.
Green = In the game.
Del tha Funkee Homosapien (solo material):
Don't Forget The Bass
Hoodz Come In Dozens
Stress The World
If You Must
Both Sides of the Brain
I Wish My Brother George Was Here
No Need For Alarm
Time Keeps on Slipping (featuring Damon Albarn of Blur and Gorillaz)
Rock The House
If I had to condense the lists~ I would like:
A Deltron 3030 pack featuring: Positive Contact, Time Keeps On Slipping, Madness
and a Del tha Funkee Homosapien pack featuring: Mistadobolina, Don't Forget The Bass, and If You Must
Please request some songs here: http://www.rockband.com/request