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Aye aye Skipper! The whistle was born on PAL, I was filling out the music bio spreadsheet in the Music chat channel and I put down "whistle" for my third instrument (I play a lot of instruments so this was a hard choice). That made me realize I hadn't busted out my whistle chops yet in open mic. I added the whistle section just for open mic, that has never been a part of that song's performance before!

I spend a lot of time whistling ;)

RE the quicker verse - when I played this song live with a band we would jam out on that quicker section for a while, that song was always a crowd pleaser and a good way to get people up dancing - the transition to the fast section always seemed to have a galvanizing effect on a crowd :)