Answer
Latin is the predominant language in Palestrina's compositions. As a devout Catholic and choirmaster at the Vatican, Palestrina's music was primarily liturgical, intended for use in church services. The Catholic Church has historically used Latin as its official language, and Palestrina's works reflect this tradition. His sacred choral music, including masses, motets, and hymns, are renowned for their intricate polyphonic textures and their adherence to the principles of Renaissance counterpoint.