Gregorian chant was the official music of the Catholic Church during the Middle Ages. It featured a single, unaccompanied melodic line sung in Latin. Organum was an early form of polyphony where a second voice was added above the Gregorian chant. Motets were composed pieces featuring Gregorian chant with additional independent rhythmic parts. Troubadours were poet-musicians who composed love songs and traveled throughout Europe performing for audiences. Estampies were instrumental dance pieces from the Middle Ages characterized by short, repeating phrases in a lively compound meter.