A concerto is a large-scale composition for an orchestra plus a soloist or a group of soloists. The soloist(s) alternate playing with or alongside the larger ensemble to provide opposition and contrast.
Concertos have three movements – fast, slow, fast.
Baroque composers who wrote concertos include Vivaldi (who wrote over 500, around half of them for violin), Bach and Handel.

Antonio Lucio Vivaldi
There were two types of Baroque concerto - the concerto grosso and the solo concerto.
The concerto grosso:
Listen to the opening of Bach’s Brandenburg Concerto No. 4. The solo group of violin and two flutes are prominent at the beginning and are then joined by the ripieno strings. Listen for the harpsichord playing the continuo.
The Baroque solo concerto::
Listen to this extract from Vivaldi’s Four Seasons.
Notice the contrast between solo violin and ripieno passages.
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