K: 1. "Kochel", used instead of opus numbers to designate the works of Mozart. 2. "Kirkpatrick", used to designate the works of Domenico Scarlatti.
Kapellmeister: "Master of the chapel." Director of music for a church or royalty.
Key: The tonal center based on the tonic note of the scale.
Klavier: 1. German term for a keyboard instrument, now primarily meaning piano, used as a descriptive term by composers in the baroque period.
Kreuz: (Gr.) A sharp.