Originally Posted By: RobbMiller

I'm playing a song that has the following progression

Asus2 Csus4 G

What key am I in?




If presented with only those three chords, the key of C Major, as a turnaround is the most likely answer. This progression "wants" to resolve to C. Try playing the three chords and adding a C Major at the end.

However, this may or may not be the key of the song in question, as it could also represent an internal modulation in some cases, if viewed as a set of substitions for the ii-V-I in C.

To find out the Key Signature that the entire song itself might be written in requires more information, all of the chords involved in the entire song progression order.

Typically for the greater majority of Western Music, the very last Bass note (lowest note heard is the Bass note regardless of instrument playing it) will be the Root of the Key that the song would be written in, with of course some very few exceptions.


--Mac