There are areas in a song that can change keys many times without changing the song's key signature. They are called key areas and are explained in the attached PDF :

https://www.dropbox.com/s/fr3y5ungopeuzdd/Key%20areas.pdf?dl=0

This is how those out of the song key signature chords are explained. Basically any chord can come after any other chord, even if the modulation is abrupt.


I'm no longer allowed to go caroling at the psych hospital.
I guess Do You Hear What I Hear was a bad song choice!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware