To play the Bbaug chord, place the little finger on the 3rd fret of the top g-string, middle finger on the 2nd fret of the C-string, ring finger on the 2nd fret of the E-string, and index finger on the 1st fret of the bottom A-string.
The Bbaug chord (also known as an A#aug chord) contains the notes Bb-D-F#.
To build a Bbaug chord, take the augmented triad formula (1-3-#5) and apply it to the B major scale (Bb, C, D, Eb, F, G, A).
Identify the first, third, and fifth scale degrees in a Bb major scale which are Bb-D-F.
Because the fifth scale degree is a "#5" (said "sharp five") raise the F note a half step to F# making the chord augmented with the notes Bb-D-F#.
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