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The tritone scale is created from two major triads that are a tritone apart. In this case, I'm using the G and Db major triads that result in a hexatonic scale G-Ab-B-Db-Dn-F and can be used for altered dom7 lines over both G7 and Db7. This scale can be played in position on the guitar using three distinct patterns, or modes. The 1st mode pattern starts on the root of each triad, the 2nd mode starts on the third of each triad, and the 3rd mode starts on the fifth of each triad.

Technically, these are not all 3rds. The sequence is constructed by playing the 3rd note to the 1st, the 4th note to the 2nd, the 5th note to the 3rd, etc., similar to how you would play any seven note scale (e.g. major, natural minor) in intervals of descending 3rds. With the Tritone Scale you get a reoccurring interval sequence of M3 - P4 - m3. The 1st Mode starts with a M3, the 2nd Mode starts with a m3, and the 3rd Mode starts with a P4.

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