The Bb Diminished Arpeggio contains the following notes:
Bb – Db – Fb
It is essentially an Bb minor chord, with a flat 5.
Here’s how to play the Bb diminished arpeggio in the open position.
Bb Diminished Arpeggio CAGED Positions
Here are the 5 CAGED positions for the Bb diminished arpeggio on the guitar (notes and tabs).