Heinrich Isaac, a 15th-century composer, known as "Ugonis de Flandria"
This massive work includes writings on philosophy and biography in addition to music theory, and includes no less than 120 complete compositions by composers of the preceding generation (including Josquin, Ockeghem, Obrecht, Isaac and many others).
Nowak also studied the music of Heinrich Isaac, Joseph Haydn, Austrian church and folk music, and various Austrian composers from the Middle Ages (1480s onwards).
The city is also well-known to music-lovers as the subject of 15th-century composer Heinrich Isaac's tenorlied Innsbruck, ich muss dich lassen, with a text about his sorrow at having to leave his post at court.
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Josquin's chanson was used as the basis for works by a number of other composers, including a version by Heinrich Isaac, and the five-voice chanson "Vous seulement" by Simon Moreau.
Amongst the more well-known versions of the song are the 3-voice version by Busnois, its reworking for 6 voices by Alexander Agricola, a 3-part instrumental version possibly by Josquin, and a 3-voice version by Heinrich Isaac.
This was the largest sixteenth century collection of Mass Proper settings, mainly by composer Heinrich Isaac, with the portion left unfinished completed on his death by his student Ludwig Senfl.
He claimed in his Toscanello in musica (1523) that he had been friends with Obrecht, Josquin, and Heinrich Isaac in Florence If true, the time frame would have been most likely in 1487 (Bergquist 1964, 24).