Right, am told Sweet Child o mine is in the key of D, it contains the chords D C G. So how from those tchords do you get D? what is the key of a song with the chords, say G A B for instance? And i heard the knocking on heavens door is in G, but it contains the same chords as sweet child which is in D.
Finally wot about songs with 30 chords!! rocket queen by GnR for example!!

Later Torby