Nothing like the grind of David Gilmore's guitar solo in Comfortably Numb on a sweet car sound system cranked to the max, expecially the version on the live albumn Pulse. Or I occasionally go the other way and it's something from Metallica. But probably 90% of the time it's Gilmore's guitar - Comfortably Numb, Sorrow, Time, Shine on You Crazy Diamond, On the Turning Away.... And, no, I'm not smoking anything while I drive and listen, hehe.