The A-flat note is just as much a subtonic note in B-flat major as
A# Major / B♭ Major chord on a 10 Musical Instruments
A# Major / B♭ Major chord on a 10 Musical Instruments
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A# Major / B♭ Major chord on a 10 Musical Instruments
B Flat (Bb) and A Sharp (A#) Guitar Chord Demonstration
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What Chords Are In The Key Of Bb Major? - Music Theory