Which mode you use depends on the chord progression. If you have a progression that goes C, Am, G, it's gunna sound like rat crap if you try to play C Dorian over it. You have to use major. Now if your progression goes Cm7, F7, Gm7, the C Dorian will work fine. It all has to do with how the modes fit into the revolving key signature of the chord progression.


Well, my sig is a poem alright. It's the first stanza from a Lord Byron poem actually.