Basso continuo is a form of musical accompaniment used in the Baroque period. It means "continuous bass".
Basso continuo, sometimes just called "continuo", was played by an instrument providing chordal accompaniment such as a keyboard instrument or plucked string instrument such as the lute along with another bass instrument such as cello, violone, or bassoon. The keyboard instrument was normally a harpsichord but could also be an organ, such as a small portative instrument.