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(Italian: "serious opera"), style of Italian opera dominant in 18th-century Europe. It emerged in the late 17th century, notably in the work of Alessandro Scarlatti and other composers working in Naples, and is thus frequently called Neapolitan opera. The primary musical emphasis of opera seria was on the solo voice and on bel canto, the florid vocal style of the period. Chorus and orchestra played a circumscribed role. High voices were cultivated, both in women and in the castrati, or eunuch sopranos. Music and text were divided into recitative (simply accompanied dialogue sung with speech rhythms), which advanced the dramatic action, and arias, solos that reflected a character's feelings and also served as vehicles for vocal virtuosity. Arias characteristically took the da capo form (ABA), the first section (A) being repeated after the B section, but with improvised embellishments.