Space plays and stops
- Notes and intervals
- F#M3A#M3C##2Em3G2A
- Extends
- F# Dominant 7
F# Altered, written F#7alt, is built from F#, A#, C##, E, G and A: the root, major 3rd, sharp 5th, minor 7th, flat 9th and sharp 9th.
Its 3rd and 7th, A# and E, 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. C7, a tritone away, has the same two notes the other way up, so it can stand in for F#7alt as its tritone substitute.
In the progressions here, F#7alt is the V7alt of the Minor ii-V Progression in B and the VI7alt of the Minor ii-V to ii-V-I Progression in A.