As my avatar and my sig line would indicate, RUSH is my all time favorite. I'm looking forward to next years tour and doing some driving out west to catch as many shows as I can in 3 weeks.
Second favorite would be Neil Young and Crazy Horse.
Rage Against The Machine is my all time favorite but I like alot of others as well.
Tool
Disturbed
A Perfect Circle (basically Tool with a different name)
Pantera
Deftones
Seether
Red Hot Chili Peppers
Tool
KoRn
Bullet for My Valentine
Five Finger Death Punch
Sevendust
pre Black Album Metallica
Staind (before they went soft)
Avenged Sevenfold
Chevelle
Jonny Lang (Lie to Me)
Mudvayne
Rise Against
Slipknot
Killswitch Engage
Older:
Stevie Ray Vaughn
AC/DC
Bob Seger
Kenny Wayne Shepard
Clapton
Pink Floyd
Rush
Testament
Andy Timmons (from Danger Danger)
Joe Satriani
Tool, easily. APC is up there. I'm just a MJK fan.
No other rock that I've enjoyed that's been put out in the last decade. But I like all the classics of hard rock/metal. Everything now sucks though.
I listen to mostly rap now.
Em, Jay-z, Kanye, Common, Tyler the Creator, BIG, Nas.
I also like singer piano players, Elton John and Ben Folds top that list.
I can do country, but only straight hillbilly-country. I don't like modern pop-country.
Also an ICP fan. They aren't good musically, but they're borderline genius at marketing and entertainment. Even if you hate the music, a live show is an experience you'll never forget. Like seeing blue man group, except you go home half deaf and bleeding.