I really like a lot of the songs that the Beatles covered -
"Twist and Shout" - The Top Notes "Long Tall Sally" - Little Richard "Kansas City/Hey-Hey-Hey-Hey!" - Little Willie Littlefield/Little Richard "Boys" - The Shirelles "Money (That's What I Want)" - Barrett Strong "Roll Over Beethoven" - Chuck Berry
Nirvana 'Where Did You Sleep Last Night'. Actually every cover on the Unplugged album was great. I'd also throw in Pearl Jam covering 'Rockin' in the Free World' since they basically made it their own. Metallica doing 'Turn the Page' I think is at least as good as Seger's but I don't like Seger. The new 'Zombie' is real good and a lot of you all already covered (no pun intended) a lot of the good ones.
Jack Johnson covers 'Imagine' and I think that's a decent cover. Ram Jam covering Black Betty also is really good. I'll think of others probably as the day goes on.