Classical music voice teachers or from completion of a formal program offered by a Conservatory, college or university, such as a Bachelor of Music or Master of Music degree (which includes individual lessons from professors). In classical music, "...extensive formal music education and training, often to postgraduate [Master's degree] level" is required. Performance of classical music repertoire requires a proficiency in sight-reading and ensemble playing, harmonic principles, strong ear training (to correct and adjust pitches by ear), knowledge of performance practice (e.g., Baroque ornamentation), and a familiarity with the style/musical idiom expected for a given composer or musical work (e.g., a Brahms
Music for the Requiem Mass </poem> <poem> </poem> For many centuries the texts of the requiem were sung to Gregorian melodies. The Requiem by Johannes Ockeghem, written sometime in the later 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 employ different texts that were in use in different liturgies around Europe before the Council of Trent set down the texts given above. The requiem of Brumel, circa 1500, is the first to include the "Dies Iræ". In