Space plays and stops
- Notes and intervals
- AM3C#M3E#2G
- Extends
- A Dominant 7
A Augmented 7, written A7#5, is built from A, C#, E# and G: the root, major 3rd, sharp 5th and minor 7th.
Its 3rd and 7th, C# and G, 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. Eb7, a tritone away, has the same two notes the other way up, so it can stand in for A7#5 as its tritone substitute.