Claudio Giovanni Antonio Monteverdi (May 15, 1567 (baptized) – November 29, 1643), was an Italian composer, gambist, and singer.

Monteverdi's work, often regarded as revolutionary, marked the transition from the music of the Renaissance to that of the Baroque. Enjoying fame in his lifetime, he wrote one of the earliest operas, L'Orfeo, which is still regularly performed.

Monteverdi composed at least eighteen operas, but only L'Orfeo, L'incoronazione di Poppea, Il ritorno d'Ulisse in patria and the famous aria, Lamento, from his second opera L'Arianna have survived. From monody (with melodic lines, intelligible text and placid accompanying music), it was a logical step for Monteverdi to begin composing opera, especially for a dramatically inclined composer who loved grand effect. In 1607, the premiere of his first opera, L'Orfeo, took place in Mantua. It was normal at that time for composers to create works on demand for special occasions, and this piece was part of the ducal celebrations of carnival. (Monteverdi was later to write for the first opera houses supported by ticket sales which opened in Venice). L'Orfeo has dramatic power and lively orchestration and is arguably the first example of a composer assigning specific instruments to parts in operas. It is also one of the first large compositions in which the exact instrumentation of the premiere has come down to us.