For many centuries the texts of the requiem were sung to Gregorian melodies. The Requiem by Johannes Ockeghem, written sometime in the latter half of the 15th century, is the earliest surviving polyphonic setting. There was a setting by the elder composer Dufay, possibly earlier, which is now lost: Ockeghem's may have been modelled on it. Many early compositions reflect the varied texts that were in use in different liturgies around Europe before the Council of Trent standardised texts used in liturgies. The requiem of Brumel, circa 1500, is the first to include the "Dies Iræ". In the early polyphonic settings of the Requiem, there is considerable textural contrast within the compositions themselves: simple chordal or fauxbourdon-like passages are contrasted with other sections of contrapuntal complexity, such as in the Offertory of Ockeghem's Requiem.