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An aria ( Italian for air; plural: arie or arias in common usage) in music was originally any expressive melody, usually, but not always, performed by a singer. It is now used almost exclusively to describe a self contained piece for one voice usually with orchestral accompaniment. Perhaps the most common context for arias is opera; there are also many arias that form movements of oratorios and cantatas. Composers also wrote "concert arias", not part of any larger work, such as "Ah Perfido" by Beethoven and a number of concert arias by Mozart.
In the 17th century, the aria was written in ternary form (ABA); these arias were known as da capo arias. The aria later "invaded" the opera repertoire with its many sub-species (Aria cantabile, Aria agitata, Aria di bravura, and so on). By the mid-19th century, many operas became a sequence of arias, reducing the space left for recitativeRecitative a form of composition often used in operas, oratorios, cantatas and similar works, is described as a melodic speech set to music, or a descriptive narrative song in which the music follows the words. Recitative is easily distinguished from more, while other operas (for instance those by WagnerWilhelm Richard Wagner ( May 22, 1813 February 13, 1883) was an influential German composer, music theorist, and essayist, primarily known for his operas. His music is still widely performed, the best known pieces being the "Ride of the Valkyries" from Di) were entirely through-composed, with no section being readily identifiable as a self-contained aria.