B♭ minor (also written A♯ minor) is a minor chord made of 3 notes: B♭, D♭, F. It sounds darker and more serious than a major chord, and you hear it in sad songs, ballads and most Bollywood minor-key melodies. It is the i chord of B♭ minor and turns up in 5 other keys.
The library above opens on B♭m with 14 shapes up and down the neck, starting with hand-checked ones. Tap a shape to hear it, or play it one string at a time.