Originally Posted by Schizoid

Hello Metal Heads,

There is one thing that has been confusing for a long time. I've realized when I analyze a lot of classical music they mostly never stick to one key. Even when the songs are called for example Concerto in C major; a lot of the notes are not in the C major! I don't understand that. When they refer to the key do they mean it as the main key of the song and they modulate out of the key at numerous times? I think this is the logic. Any feedback on this would be great.

Thank You All!