Space plays and stops
- Notes and intervals
- BbM3Dm3Fm3Abb7Gb
- Extends
- Bb Dominant 7
Bb Dominant b13, written Bb7b13, is built from Bb, D, F, Ab and Gb: the root, major 3rd, 5th, minor 7th and flat 13th.
Its 3rd and 7th, D and Ab, 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. E7, a tritone away, has the same two notes the other way up, so it can stand in for Bb7b13 as its tritone substitute.