G A Bminor.. is in the key of D huh... So if you have a song in which the chords are played like this,

G A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A Bminor

Thats in the key of D?!?!?!?!?

Surely A?

How do you work it out??