I learning the minor scales now. I have a question about the progressions though. Say i'm using the Gmin scale and im using the 1-4-5-1 progression (Gmin,Cmin,Dmin,Gmin). Would I be able to use a 7th chord or another chord? I see some songs have minor chords and have a 7th chord or some other type of chord. How do u determine if you can use a dim or 7th or any other chord?