A Quick One While He's Away
Now as good as the link mark j put in was good,I have a better one,mine is from their performance at The London Coliseum in 1969.
Here is the rather funny intro:http://www.youtube.com/watch?v=-rY9z8N_mcc&feature=related
Here's the actual performance:http://www.youtube.com/watch?v=E4uUr5xIfFY
This was what made stuff like Rael,Tommy,the ill fated Lifehouse(aka Who's Next),Quadrophenia,and Psychoderelict possible!
Now here's another good live performance,from the live album by which all live albums are judged,I give to the Live At Leeds version:
http://www.youtube.com/watch?v=IN6ZpEpVU18