[musicale]

I think it's OK to pitch a song down to help out the lead singer. Also can make it sound "heavier" and give it a more ambiguous (and perhaps menacing) tuning.

Some radio stations famously (or infamously) sped up songs by 2-3% to fit in more music and/or advertisements and also to sound more energetic (though also possibly chipmunky in the era before pitch correction - now we get roboty instead.) We still have "radio edits" of songs that may cut out less exciting bits and possibly speed up the song as well.

(The thing that puzzles me now is why FM radio seems to sound thin and flat compared to listening to a CD or even a decent MP3 player.)