To play the Bbaug7 chord, perform a barre by pressing your index finger on the top g-string and bottom-A string on the 1st fret, middle finger on the 2nd fret of the C-string, and ring finger on the 2nd fret of the E-string.
The Bbaug7 chord, also known as the A#aug7 chord, contains the notes Bb-D-F#-Ab.
To build a Bbaug7 chord, take the augmented seventh chord formula (1-3-#5-b7) and apply it to the Bb major scale (Bb, C, D, Eb, F, G, A).
Identify the first, third, sharp fifth, and flat seventh scale degrees in the Bb major scale which are Bb-D-F#-Ab.
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