There's a song performed by Mimi Fox called "B-flat Blues" (as part of a True Fire course she presented).
The Bb major scale is:
Bb, C, D, Eb, F, G, A
This would suggest (based on my understanding of roman numeral analysis and how chords are constructed from the scale they're played within) that the chords that were applicable would be:
- Bb maj 7
- C min 7
- D min 7
- Eb maj 7
- F dom 7
- G min 7
- A half-diminished 7
With this in mind, I'm trying to understand why she plays specific chords (e.g. why a Bbdom7 rather than a Bbmaj7, and why she plays Edim7 which isn't even in the Bb scale - Eb is but not E).
Is there a music theory reasoning behind the choice of chords played (which I've listed out below, exactly as they are played in the song, so of course you'll notice repeated chords listed):
- Edim7 (1st inversion)
The chord progression also looks to be a mixture of a 1,4,5 and a 2,5,1,6 and I'm not sure why it changes half-way through. Is there any music theory reasoning behind the change in progression?