6a: Exam7 9-dim7 ple connection6 The 7b9-dim7 connection G# E7b9 Continuing this symmetrical E7 theme, we can see the Diminisheddim7 7th as a substitute extension for Dominant 7b9. The notes in E7 are E, G# B and D. This gives major 3rd, minor 3rd, minor
the b9, F, this gives us yet another minor 3rd. If we chain these minor 3rds together, G#-B-D-F you’ll see a G# Diminished 7th. Therefore E7b9 and G#dim7 are essentially interchangeable. This example shows the connection.