Very little Italian music remains from the 13th century, so the immediate antecedents of the music of the Trecento must largely be inferred. The music of the troubadors, who brought their lyrical, secular song into northern Italy in the early 13th century after they fled their home regions—principally Provence—during the Albigensian Crusade, was a strong influence, and perhaps a decisive one; many of the Trecento musical forms are closely related to those of the troubadours of more than a century before. Another influence on Trecento music was the conductus, a type of polyphonic sacred music which had the same text sung in all parts; texturally, Trecento secular music is more like the conductus than anything else that came before, although the differences are also striking, and some scholars (for example, Hoppin) have argued that the influence of the conductus has been overstated.