Answer:
Basso continuo is the correct answer.
Explanation:
Basso continuo (continuous bass in English) was very popular during the Baroque period of music that was popular during XVII and a part of XVIII centuries.
The two instruments required (at least) were one providing chordal accompaniment, while the other one was usually a keyboard (an organ or a harpsichord were the most common ones). Cello, violone, and bassoon were other instruments used in this type of music.
