I've been improvising for a while now...about three years...and every time I just use a scale that covers the whole chord progression such as a blues scale...that's how I learned when I first learned. Now I want to start getting into changing with the chords and actually pulling some fantastic ideas with my improv, but I just can't get the what scales correspond to which chords. When I see a G7 for example on my page...is that telling me scales that start on my G? or on a concert G? Also what scale goes with a G7 or a Gm chord? How can I know what scale to use when improvising? The same goes for any chord whether &, 9, 13, augmented, diminishes, whatever...I just need major help understanding what scales and chords mean in chord progressions. Nobody thus far has been able to explain to me in a well enough way and hopefully I can find some help here.