Holy heck. Had a surprising realisation earlier while hanging out the laundry...I've had occasional (but weird) when I've heard Led Zeppelin's Immigrant Song recently, I've had inexplicable associations with, of all things, the TV show Get Smart ("good thinking, 99"). And I realised that the first few notes of its theme and the Zep son have the same melody! Who woulda thunk.
@lightweight "singing"...were there words?
@lwriemen well, humming.