Need I really say more?

Janis Joplin, ball and chain live at Monterey 1967

...for some reason links aren't working today so let's just do it the old-fashioned way because I'm not in the mood to mess around with Mr. Technology tonight!:
http://www.youtube.com/watch?v=0FlUAxqQkmc&NR=1
...and for good measure, this one too:
http://www.youtube.com/watch?v=w6ou63LX0NM&NR=1