Final answer:
The 6th degree of the B-flat minor scale is known as the submediant, which is G-flat.
Step-by-step explanation:
The 6th degree of the B-flat minor scale is called the submediant. In a natural minor scale, the 6th degree is always a whole step higher than the 5th degree. In B-flat minor, the 5th degree is F, so the 6th degree or the submediant is G-flat. This term is a part of musical theory that identifies the position of a note within a scale relative to the tonic; in this case, G-flat is the sixth note in the B-flat minor scale.
The submediant is the sixth note of the B-flat minor scale, counting from the tonic (B-flat) as the first. In this case, the submediant is the note G-flat.