A 7th flat five chord is created by flattening the 5th degree of any dominant 7th chord. E.g. a C7b5 chord contains the notes C, E, Gb and Bb (1, 3, b5 and b7).
Like augmented triads and diminished sevenths, seven flat five chord shapes can have more than one root note. Each of the shapes below has two possible names (or more if you include enharmonics). Each one can be played anywhere on the fretboard and the names will change each time it is moved. Analyze the notes in each of these shapes and then use the key cycle to learn them in all keys.
This progression uses 7b5 chords along with other types of 7th chords.