Dear Art, thanks, I hadn't thought about theatre as a source. The verse is as you wrote, and yes it is summer rain; the chorus is : Pass it on to your children, brother; Pass it on to your children, mother; You've got to work for it, fight for it, Day and night for it (BR) And every generation's got to win it a-gain.

(then repeat chorus and add closing line: Pass it on to your children, Pass it on.

Jangle any more bells, anyone?