The stile concertato (Italian: [ˈstile kont͡ʃerˈtato], lit. 'concerted style') is a style of early Baroque music in which groups of instruments or voices share a melody, usually in alternation, and almost always over a basso continuo. The word concertato is the past participle of the Italian verb concertare meaning ‘to agree, act together’, from the Latin verb concertare originally meaning “to contend or strive”.
A somewhat oversimplified, but useful distinction between stile concertato and concerto can be made: the stile concertato involves contrast between opposing groups of voices and groups of instruments: the concerto style, especially as it developed into the concerto grosso later in the Baroque, involves contrast between large and small groups of similar composition (later called "ripieno" and "concertino").