So I do not understand how to know what key a song is in. I do kind of understand the 1, 4, 5 thing, but how do you know when you listen to a song what key it is in. And a song may not always stay in that key, is that correct. Also how does the Capo thing play a part. I know all this info is probably in the lessons but I can't find it.
Thanks for any help.
