Claudio Merulo was an Italian composer, publisher and organist of the late Renaissance period, most famous for his innovative keyboard music and his ensemble music composed in the Venetian polychoral style. He was born in Correggio and died in Parma. Born Claudio Merlotti, he Latinised his surname when he became famous in Venetian cultural clubs.

The Venetian polychoral style was a type of music of the late Renaissance and early Baroque eras which involved spatially separate choirs singing in alternation. It represented a major stylistic shift from the prevailing polyphonic writing of the middle Renaissance, and was one of the major stylistic developments which led directly to the formation of what is now known as the Baroque style. A commonly encountered term for the separated choirs is cori spezzati—literally, "broken choruses" as they were called, added the element of spatial contrast to Venetian music. These included the echo device, so important in the entire baroque tradition; the alternation of two contrasting bodies of sound, such as chorus against chorus, single line versus a full choir, solo voice opposing full choir, instruments pitted against voices and contrasting instrumental groups; the alternation of high and low voices; soft level of sound alternated with a loud one; the fragmentary versus the continuous; and blocked chords contrasting with flowing counterpoint.