For whom did Vivaldi compose many of his concertos?

Vivaldi composed many of his concertos for the girls of the orphanage that employed him, known as the Ospedale della Pietà in Venice. This institution was notable for its education and musical training programs where orphaned and abandoned girls were provided with shelter and musical instruction. Vivaldi was a prominent violin teacher there and wrote numerous concertos, particularly for the talented female musicians in the orphanage. This close relationship not only allowed the girls to showcase their musical abilities but also contributed significantly to the development of the concerto form during the Baroque period. The concertos were often performed during public concerts, helping to raise awareness of the orphanage and its musical contributions to the Venice arts scene.