Tom Waits needs to be in

[Eissian]

Simply for the lyrics.  His voice might be the hardest to imitate on the planet (unless you smoke three cartons of cigarettes, drink two bottles of bourbon, and eat a pound of gravel before attempting), but it would be fun as hell to try.

[CoWmAn]

I whole-heartly agree.

[PurpleDingo]

Tango Till Theyre Sore would be epic

Maybe im just partial because i can actually do his voice (only for about a song and a half tho)