B# minor is a musical key that is often considered enharmonically equivalent to C minor. This means that while B# minor has its own theoretical identity, it sounds the same as C minor when played. The key signature of B# minor contains five sharps, which are F#, C#, G#, D#, and A#. In terms of its scale, B# minor consists of the notes B#, C#, D#, E, F#, G, and A. This key is less commonly used in compositions compared to other minor keys, but it can be found in works by composers like Johann Sebastian Bach and Frédéric Chopin.