A sonata is a musical composition typically written for one or two instruments, often featuring three or four contrasting movements. Each movement has its own distinct character and tempo, usually following a structure that includes exposition, development, and recapitulation. Sonatas are commonly composed for instruments like the piano or violin. The term "sonata" originated in the early 17th century and has evolved over time. Famous composers such as Ludwig van Beethoven and Wolfgang Amadeus Mozart contributed significantly to the sonata form, creating works that are still performed today. Sonatas are an essential part of classical music repertoire.