in the Italian music, is frequently used in pieces consisting of several parts, to mark those that are to perform alone; as fiamto solo, violino solo. It is also used for sonatas composed for one violin, one German flute, or other instrument, and a bass; thus we say, Corelli's solos, Geminiani's solos, &c. When two or three parts play or sing separately from the grand chorus, they are called a doi soli, a tre soli, &c. Solo is sometimes denoted by S.