wait I don't understand...
But can't you like...use the same 4 chords for any song ever and then just transcribe the vocal notes to match the key of those 4 chords?
wait...no...thats keys...
they mean like, the same type of chords, as in, different keys for all songs, but just, say the type of chords are always the same...ex. the major chord, minor chord, diminished etc...yes?
Because I mean like...there is a general...consensus? over what sounds nice to the ear...if we had a bunch of songs using these lesser used chords...music would be...quite ugly lol
It would probably be more artistic...but be careful what you wish for...because it would probably be really very harsh to listen to lol
http://en.wikipedia.org/wiki/Chord_%28music%29
I mean just listen to some of those seventh chords! Ouch
lol