i guess it would have to be:
Jimi Hendrix-Purple Haze
Jimi Hendrix-Star Spangled Banner
Led Zeppelin-Stairway to Heaven
Led Zeppelin-KAshmir
Led Zeppelin-Achilles LAst Stand
Ozzy OSbourne-Crazy Train
Clapton-Layla
Guns N Roses-Sweet Child of Mine
The Who-Pinball Wizard
Van Halen-Ain't Talkin Bout Love (don't really like the song but the opening riff is cool)
AC/DC-You Shook Me All Night Long
Chuck Berry-Johnny B. Goode
there are many others, but this is all i can think off now
To improve technique and of course trying to keep all as clean as possible. I know my own limits and speed limits and so on I never play anything I'm not capable of. That wouldn't make any sense. After three years of playing I tried to play everything as fast as possible and that sounded, I would say, like shit, and I didn't realize that if I'd play bit slower things than I was capable of playing then everything would sound much better.
--Aleksi Laiho - Advice to Play By