This article or section should be merged with Tritone substitution.

In music, substitute dominant chords are also known as Sub-V (pronounced Sub Five) chords because they originate from a reharmonisation of the original dominant chord. For example, in the key of C Major, the V7 of C Major is G7. The notes in G7 are G,B,D and F. Small icon for merging articles File links The following pages link to this file: Friction Jacobin Private branch exchange Pro-feminist Rotary piston engine Tagalog language Saint Veronica Spoiler effect Parser Password length equation Sudovian language Wikipedia:Why arent these pages copy-edited Static scoping Maximum power theorem General... In jazz music a tritone substitution is the use in a chord progression of a dominant seventh chord (major/minor seventh chord) that is three steps (a tritone) away from the original dominant seventh chord. ... ...

The guide tones (which are also the tritone interval) is B and F. The Sub-V chord is found by finding a new root for the original G7 chord, looking at a diminished fifth above, hence the note Db. By keeping the original B and F notes and changing the root note to Db, you get a new dominant chord which is the Db7. This also creates a nice chromatic motion downwards a half-step resolving into the C Major chord. Hence, the reason why bebop players called this the Sub-V reharmonisation. This can be done on any dominant chord that originally intended to resolve a perfect fifth down, creating a new resolution a half-step down.