Favorite cover?

Quicksilver Messenger Service, "Who Do You Love?" and "Mona" promptly come to mind, as does Janis Joplin's "Summertime" and (of course), "Ball and Chain".

Allman Brothers Live at the Fillmore East playing "Stormy Monday"

+1 on picks by bdp24 & gasnsteering. I forgot how good the Guess Who & Frigid Pink covers were.

++1 on repeluso's pick of Baby It's You by Smith.  That song should have been a huge hit. I always found it interesting that the Beatles stopped doing cover songs shortly after this came out. That was probably because their songwriting was getting too good to be doing covers anymore. But, the fact remains that the Beatles wimpy cover of Baby It's You is embarrassing when compared to the Joplinesque @** kicking version by Smith.

If you're in the mood to get your heart broken, check out Kim Richey's cover of "Mexico" (CAKE) on YouTube.

The Who’s cover of Eddie Cochran’s “Summertime Blues.”