To play the A#dim7 chord, place the 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 strings ring open.
The Bbdim7 chord, also known as the A#dim7 chord, contains the notes Bb-Db-Fb-G.
To build a Bbdim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the Bb major scale (Bb, C, D, Eb, F, G, A). The "bb7" indicates a double flat seventh, meaning you lower the seventh scale degree two half steps.
Identify the first, flat third, flat fifth, and double flat seventh scale degrees in the Bb major scale which are Bb-Db-Fb-G. In this case, the Fb note is the enharmonic equivalent of an E note.
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