Harmonice Musices Odhecaton
The Harmonice Musices Odhecaton ("One Hundred Songs of Harmonic Music", also known simply as the Odhecaton) is an anthology of polyphonic secular songs published by Ottaviano Petrucci in 1501 in Venice. It is the first book of polyphonic music ever to be printed using movable type.
Source: Wikipedia — Harmonice Musices Odhecaton (CC BY-SA 4.0)