I notice when I open BIAB it defaults to the key of C. If a load a demo of a style it might be in some other key but I notice that the key setting remains at C. I find this confusing. Why does it not change to the key being played in the demo song?

Secondly let's say I want to write a chord progression in the key of A minor. Since Am is the relative minor of C, do I need to change the key setting on C, or change it to Am?

So I am not really sure of the best practices of how and when to use the key setting in BIAB. Thanks for helping a noobie!