Although many beginning band books don't teach this fingering in the beginning, it is a simpler fingering and should have little to no effect on intonation or tone. Considering the inherent complexity of beginning flute fingerings and the frequency of flat keys in early band literature, learning thumb Bb first is a valid decision.

This is usually the first fingering that beginning band books will teach. However, many teachers agree that it is an unnecessary added complication for beginning flutists. It is awkward compared to thumb Bb. Use this fingering when playing in keys with no Bb if that is more efficient than using the lever Bb shown on the right. It can also be used with a chromatic scale.

The lever key can be found to the left of your left pointer finger and is played by shifting your knuckle over slightly. It can be used when both Bb and B natural are required, similar to the one and one Bb.