 This style, with its variations as it spread across Europe after 1600, helped to define the beginning of the Baroque era.Polychoral music was not limited to Italy in the Renaissance; it was also popular in Spain and Germany.There are examples from the 19th and 20th centuries, from composers as diverse as Hector Berlioz, Igor Stravinsky, Béla Bartók, and Karlheinz Stockhausen.