Most people however have no music, little music hardly any music in their heads.

Possibly true when we think of folk music? And I don't have it but believe me, I know people with the thousand plus type repertoire and quite brilliant players to go with it too.

Possibly, while I too can get cynical, for the rest of us, we carry strange mixtures, eg. I might know Shall We Dance, The Trout Quintet a lovely Albeniz piece adapted for guitar - Granados - can't play any but it is amazing what we pick up.