The Baroque era saw the development of new musical styles and genres between 1600-1750. A key doctrine was that a piece of music should express a single emotion. Early styles included Stile Antico which used polyphony and strict rules versus Stile Moderno which broke rules to effectively express text. The Florentine Camerata in the 1570s-80s planned to revive Greek opera and develop monody with solo melody and basso continuo accompaniment. Early opera began around 1600 with Dafne by Peri and L'Euridice by Peri and Caccini. Monteverdi's 1607 opera L'Orfeo was highly influential in establishing conventions for the new genre such