Starting out for me there were two bands who supplied my beginner "exercises":
[U]Pink Floyd [/U]
Mother, Is There Anybody Out There, Wish You Were Here, Money
[U]Led Zeppelin[/U]
Heartbreaker, Rock'n'Roll, The Lemon Song, Immigrant Song, Whole Lotta Love

edit: A Horse With No Name was mentioned, but it's actally by America, and Schmange tabbed most of it here.