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This is one you've heard many times to end blues songs (and jazz, swing, country, rock, etc.). The idea is to add a bit of drama by delaying the arrival of the final I chord, the Tonic by use of a Flat 2 (bII) chord. This is called a Tritone Substitution.
The term Tritone Substitution is named as such because:
1. It is a type of chord substitution, which means that one chord can be replaced with, substitute for or "stand-in" for another chord. This happens when two chords share one or more notes in common. In this case the F7 is a substitution for the normal V chord, the B7.
B7 contains the following notes: B (1st) - D# (Major 3rd) - A (minor 7th)
F7 contains the following notes: F (1st) - A (Major 3rd) - Eb (minor 7th)
D# and Eb are the same pitch with a different name (this is called enharmonic). Notice that both B7 and F7 share the notes A and D#, which are a tritone apart. Further, their functions are reversed as the root notes change! The major 3rd becomes the minor 7th and vice versa.
This means that instead of playing a V - I resolution, we can use the bII chord to effectively end the song by playing bII - I.
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