Costanzo Porta (c. 1528–1601) was an influential Italian composer of the late Renaissance, primarily known for his contributions to the genre of madrigal. Porta was active during a time when the madrigal reached its zenith, characterized by its expressive text-setting and intricate polyphony. His notable works include several collections of madrigals, with "Madrigali a cinque voci" (Madrigals for Five Voices) published in 1580 and "Madrigali a quattro voci" (Madrigals for Four Voices) published in 1586. Porta's compositions are distinguished by their lyrical melodies, emotional depth, and innovative use of harmony, which paved the way for the later developments in the Baroque era. Porta's impact on music is significant as he helped shape the madrigal style, influencing contemporaries and later composers. His work exemplifies the transition from the intricate polyphony of the Renaissance to a more expressive and dramatic approach that would characterize the following musical eras. His legacy is evident in the continued performance and study of his madrigals in both academic and concert settings.