Space plays and stops
- Notes and intervals
- GM3B2DbM3F
- Extends
- G Dominant 7
G Dominant b5, written G7b5, is built from G, B, Db and F: the root, major 3rd, flat 5th and minor 7th.
Its 3rd and 7th, B and F, 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. Db7, a tritone away, has the same two notes the other way up, so it can stand in for G7b5 as its tritone substitute.