-Purple Haze (+Voodoo child?)by Hendrix
-Paranoid (and almost every song ever done by?) by Black Sabbath (Iommi is a riff God!)
-Whole Lotta Love (+ communication breakdown, heartbreaker, good times bad times, how many more times, lemon song, rock and roll?) by Led Zeppelin (Page Rules!)
-You really got me by the Kinks
If you feel like showing off you could try:
-Black Dog by Zeppelin
-Layla by Derek and the Dominoes (Eric Clapton)
-Reelin' in the years (the cool bit before the solos) by Steely Dan