B♭ major (also written A♯ major) is a major chord made of 3 notes: B♭, D, F. It sounds bright, settled and complete, and you hear it in the home chord of countless songs in every style. It is the I chord of B♭ major and turns up in 5 other keys.
The library above opens on B♭ 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.