Adrian Willaert was a Flemish composer of High Renaissance music. Mainly active in Italy, he was the founder of the Venetian School. He was one of the most representative members of the generation of northern composers who moved to Italy and transplanted the polyphonic Franco-Flemish style there.

In music history, the Venetian School was the body and work of composers working in Venice from about 1550 to around 1610, many working in the Venetian polychoral style. The Venetian polychoral compositions of the late sixteenth century were among the most famous musical works in Europe, and their influence on musical practice in other countries was enormous. The innovations introduced by the Venetian school, along with the contemporary development of monody and opera in Florence, together define the end of the musical Renaissance and the beginning of the musical Baroque.