Final answer:
Figured bass, also known as basso continuo or thoroughbass, is a musical notation system that allowed performers to fill in harmonies during the Baroque period.
Step-by-step explanation:
The correct answer is figured bass.
Figured bass, also known as basso continuo or thoroughbass, is a musical notation system that was developed during the Baroque period. It allowed the performer to improvise harmonies and fill in the accompanying chords based on the notated numbers or figures. This notation system was primarily used by basso continuo players, who were responsible for providing the harmonic foundation for Baroque music.