Final answer:
A minor seventh (mi7) above a B-flat is an A-flat. A minor seventh interval is made up of 10 semitones, and counting up from B-flat, A-flat falls right on the tenth semitone.
Step-by-step explanation:
The question asks what pitch is a minor seventh (mi7) above a B-flat. In music theory, a minor seventh is an interval consisting of 10 semitones above the root note. Starting on B-flat, if you count up 10 semitones (including B-flat as the first), you land on A-flat. Therefore, the pitch a minor seventh above a B-flat is A-flat.