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Which instruments commonly formed the concertino in a Baroque concerto grosso?

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caricature of Antonio Vivaldi — concerto Caricature of Antonio Vivaldi, pen and ink on paper by Pier Leone Ghezzi, 1723; in the Codex Ottoboni, Vatican Library, Rome. The inscription below the drawing reads, “Il Prete rosso Compositore di Musica che fece L'opera a Capranica del 1723” (“The red priest, composer of music who made the opera at Capranica [College in Rome] of 1723”).

In a Baroque concerto grosso, the concertino—the small group of soloists—typically followed the instrumentation of the trio sonata, which was the prevalent chamber music genre of the era.1

This standard setting generally consisted of:
* Two violins123
* Basso continuo, which included a low melody instrument (such as a cello) and a harmony instrument (such as a harpsichord) to realize the chords.12

While this string-based trio was the most common configuration, composers frequently utilized other combinations as well. Wind instruments were often incorporated into the concertino, and as the genre matured, composers like Antonio Vivaldi and Johann Sebastian Bach experimented with highly varied scoring, including combinations of strings, woodwinds, and other instruments like the lute or viola d'amore.13