To play the Bbdim chord, place the little finger on the 3rd fret of the top g-string, index finger on the 1st fret of the C-string, and middle finger on the 1st fret of the bottom A-string. Let the other string ring open.
The Bbdim chord, also known as an A#dim chord, contains the notes Bb-Db-Fb.
To build an Bbdim chord, take the diminished triad formula (1-b3-b5) and apply it to the Bb 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.
Lower the third and fifth scale degrees a half step in accordance with the diminished triad formula, which results in the notes Bb-Db-Fb for the Bbdim chord. In this case, the "Fb" refers to the enharmonic equivalent which is an E note.
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