I can’t top this explanation of what you are about to hear -
I swear drugs had nothing to do with it… but I’ve had this technique of playing Beatles songs whereby you modulate (change key) every bar, either going down or up 1 semi-tone, but then return to the home key in the next bar. It makes for some pretty challenging musical listening!!
Yesterday , orig. Lennon/McCartney, as performed by Misplaced Modulation Theatre.
I’ve spent too much time singing choral arrangements of Broadway medleys, because this just reminded me of the excessive key changes in those. Hilarious!
I ain’t gonna change keys no more. . . .