Space plays and stops
- Notes and intervals
- C#M3E#M3G##2B
- Extends
- C# Dominant 7
C# Augmented 7, written C#7#5, is built from C#, E#, G## and B: the root, major 3rd, sharp 5th and minor 7th.
Its 3rd and 7th, E# and B, 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. G7, a tritone away, has the same two notes the other way up, so it can stand in for C#7#5 as its tritone substitute.