Answer:
A.Sonata, type of musical composition, usually for a solo instrument or a small instrumental ensemble, that typically consists of two to four movements, or sections, each in a related key but with a unique musical character.
B.Concerto, plural concerti or concertos, since about 1750, a musical composition for instruments in which a solo instrument is set off against an orchestral ensemble. The soloist and ensemble are related to each other by alternation, competition, and combination.
C.Symphony, a lengthy form of musical composition for orchestra, normally consisting of several large sections, or movements, at least one of which usually employs sonata form (also called first-movement form).
