Ad libitum, ad lib - A term which permits the performer to vary the tempo and/or to include or omit a vocal or instrumental part. Synonymous with a piacere.
Basso continuo, Continuo, Thorough-bass - The Baroque practice in which the bass part if played by a viola da gamba(cello) or bassoon while a keyboard instrument performed the bass line and the indicated chords.
Canon - The strictest form of imitation, in which two or more parts have the same melody but start at different points.
Degree - One of the eight consecutive tones in a major or minor scale.
Fine - The end.