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".
Favorite cover?
As a (minor) film buff, I almost invariably prefer originals. But when it comes to audio, I have found more than a few covers that I prefer to the originals. So, to kick things off, and with all due respect to Boz Scaggs, I absolutely LOVE this live Incognito version of Lowdown:
https://www.youtube.com/watch?v=dH%E2%80%A6
What's on the top of your lists?
https://www.youtube.com/watch?v=dH%E2%80%A6
What's on the top of your lists?