The Who used to hold the Guinness Book Of World records top spot for volume-I don't think that they still do.
Speaking of The Who, gotta go with Baba O'Riley, Eminence Front, Behind Blue Eyes, Bargain, and My Generation. Another great guitar solo would have to be ZZ Top's La Grange, also Heart's Barracuda, and Crazy On You, for blues, I'd have to say Chris Duarte's Big Legged Woman.