Space plays and stops
- Notes and intervals
- GbM3Bbm3Dbm3FbM3Ab5Eb
- Extends
- Gb Dominant 7
Gb Dominant 13, written Gb13, is built from Gb, Bb, Db, Fb, Ab and Eb: the root, major 3rd, 5th, minor 7th, 9th and 13th.
Its 3rd and 7th, Bb and Fb, are its guide tones: they say what kind of chord it is, so voicings are built around them and the root is often left to the bass. C7, a tritone away, has the same two notes the other way up, so it can stand in for Gb13 as its tritone substitute.