The document discusses the concerto, a large-scale musical composition for orchestra and soloist(s) that alternates between the soloist(s) and larger ensemble. It notes that concertos from the Baroque period typically had three movements and were either a concerto grosso, featuring a small group of soloists with a larger group, such as Bach's Brandenburg Concertos, or a solo concerto. Prominent Baroque composers of concertos included Vivaldi, Bach, and Handel.