Space plays and stops
- Notes and intervals
- CM3EM3G#2Bb
- Extends
- Dominant 7
C Augmented 7, written C7#5, is built from C, E, G# and Bb: the root, major 3rd, sharp 5th and minor 7th.
Its 3rd and 7th, E and Bb, 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. Gb7, a tritone away, has the same two notes the other way up, so it can stand in for C7#5 as its tritone substitute.