In the Baroque period, the differences between a concerto and a "sinfonia" (also "symphony") were initially not all that clear. The word "sinfonia" would, for example, be used as the name for an overture to a stage work. Antonio Vivaldi wrote "concertos" which did not highlight individual soloists and which were stylistically more or less indistinguishable from his "sinfonias." The Baroque genre that comes closest to the Classical "sinfonia concertante" is the concerto grosso; among the most famous of these are those by Arcangelo Corelli and George Frideric Handel.