in the Italian music, is frequently used in pieces consisting of several parts, to mark those that are to perform alone; as fiauto 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 solo, Geminiani's solo, &c. When two or three parts play or sing separately from the grand chorus, they are called a doi solo, a tre solo, &c. Solo is sometimes denoted by S.