Mozart Works include Sonatas (7 letters), Concerti (8 letters) and Operas (6 letters). Sonatas are a type of musical composition for one or two instruments, usually in several movements. Concerti are compositions for one or more solo instruments and orchestra. Operas are musical works combining singing and instrumental music, typically involving a dramatic story. Wolfgang Amadeus Mozart was an Austrian composer who wrote many of these works during the Classical period.