From the My Generation liner notes by Brian Cady:
"This is the lead track on the LP. We all wrote it except Roger. In a way, I suppose it's a surfing sound. It's an American sound like something you get from the Wailers. I got out of this something I've always wanted to get out of a piece of music. I like that piano break. Actually it's John getting a piano sound out of his guitar. Nicky Hopkins is on this, he used to be with Cyril Davis. This session went on much longer and at the end we were all falling about."
The title came from John Entwistle's nickname but this instrumental remains most famous for Keith's contribution. According to Tony Fletcher, this song is based on The Surfaris' "Waikiki Run" with a lower guitar line and a more sinister melody. Released in Europe as the B-side of "The Kids Are Alright." On the U.S. album this track came before "A Legal Matter." The 2002 stereo version has a hard ending eight seconds after the original mono fade out.