Concertino (group)
A concertino is the smaller group of instruments in a concerto grosso
Concerto grosso
The concerto grosso is a form of baroque music in which the musical material is passed between a small group of soloists and full orchestra...

. This is opposed to the ripieno
Ripieno or tutti can refer to:*the larger of the two ensembles in the concerto grosso. This is opposed to the concertino which are the soloists.*the notes added when realizing the figured bass of a basso continuo....

which is the larger group contrasting with the concertino.

Though the concertino is the smaller of the two groups, its material is generally more virtuosic than that of the ripieno. Further, the concertino does not share thematic material with the ripieno, but presents unique ideas. This contrast of small group to large group and one thematic group against another is very characteristic of Baroque ideology — similar to terraced dynamics where the idea is significant contrast.
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