The opening section of sinfonia for strings and continuo from handel's messiah start with Basso Continuo.
The basso continuo has the effect of emphasizing the bass part, its usually played with a keyboard instrument and an instrument such as a cello or bassoon, and they keyboard player improvises chords following written numbers above the bass part.
The bass section of a baroque accompaniment is typically played by two instruments: a keyboard instrument, like an organ or harpsichord, and a low, melodic instrument, like a cello or bassoon.
In music, the term "basso continuo" refers to a system of somewhat improvisational accompaniment performed on a bass line, typically on a keyboard instrument.
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