I'd originally posted this in Tomo's excellent thread about using triads as the basis for soloing and am hoping prof2915 or others will expand upon this: Originally Posted by prof2915 I´ve always found it to be more musical to think in terms of chords (not just triads) instead of scales when improvising. If I think: "F melodic minor" over a E7 (altered) it never sound as good as when I think: "Bb13" - and play pretty much whatever lick related to this chord that comes in mind - over the same E-dominant. Originally Posted by slackandsteel Hey Prof, in your example I think F melodic minor over E7 for an altered dominant sound, but I like your idea of thinking Bb13 chord. How did you come up with Bb13 in this example ? I get the tritone sub concept, but why 13th chord a b5th up from the root of the dominant for the altered sound? Can you please hip us to the concept and/or provide more examples of this type of substitution method? I'm really intrigued! Thanks!