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Definition of Bis key
1. Noun. (music) A key using alternative fingerings for certain notes on woodwind instruments. Specifically, a key that is located between the first and second keys operated by the left hand on a saxophone. Pressing LH1 and the bis key simultaneously results in the sounding of a Bb. This is especially useful when playing in keys with many flats. ¹
¹ Source: wiktionary.com