1. Place your left index finger on the open register key.
2. Place your left middle finger on the half-hole B-flat key.
3. Place your left ring finger on the C key.
4. Place your right index finger on the F key.
5. Place your right middle finger on the G key.
6. Blow into the mouthpiece with a steady airstream.
The resulting note should be a quarter note B-flat.