Hey guys, just a quick question perhaps someone could help me out with. I've come up with a chord progression, and I was wondering how I figure out what the key of the song is from the chords. I've read the "What chords are in what key and why" article, but I was wondering if instead of starting with the key and finding the chords, you could start with the chords and find the key (I know there's a way, perhaps you can enlighten me? :P)

Anyways, the progression is:

Am, Cadd9, G, D.

Any help at all will be greatly appreciated. Thanks.
seems to be G, but maybe C
CO-Founder of the Geddy Lee Fanclub
PM me or RIC4003 to join

Member#15 of the RushClub
and Alex Lifesons biggest fan

Pm Maet to join

Proud Member of the Yes Club
Pm TheHeartbreaker to join
Anyway you can help me figure out how you came to that? I'd really like to know how to do this. Thanks for the response though man.
Am - A C E
Cadd9 - C E G D (I think... Not good with add9's)
G - G B D
D - D F# A

So you look at all the notes you're using and notice that the only accidental is F#. Which key has that in it and the rest of the notes as well? G Major.
Quote by Godzilla1969
I love you, Muphin. You have great taste in music.

Quote by Pacifica112J
Muphin > You

The Cooperation
G major , yes, kinda, but it sounds like it would come to rest on D major, i would use


which i think (don't quote me) is mixolydian
but i'm not good at remembering the name so it might be different.