Originally Posted by: NickFerra
One progression is C, Em, Am, Em with a capo on the third fret.
With the capo those chords are transposed to:
C -> E-flat
E min -> G min
A min -> C min
E min -> G min
So, you could be in the key of E-flat major.
E-flat (I) - G min (iii) - C min (vi) - G min (iii)
But you could also view those chords as part of the key of G minor.
E-flat (bVI) - G min (i) - C min (iv) - G min (i)
The best way to determine this is to know what the melody line is. What notes the singer sings. However, if this is just a chord progression without an already established melody line, then you could go either way.
These tutorials will show you how to figure out what key a group of chords are in & what scales or notes you can use to solo over them with!
http://www.guitartricks.com/tutorial.php?input=876
http://www.guitartricks.com/tutorial.php?input=483
http://www.guitartricks.com/tutorial.php?input=491
Hope this helps! Ask more if necessary & have fun!
