Opus aureum
Subtitle: Musice castigatissimu[s] de Gregoriana et figuratius atq[ue] contrapu[n]cto simplici perco[n]mode traictans om[n]ib[o] cantu oblectan tibus vtile et necessarium e diuersia excerptum. Fata regunt finem, spero dij cepta secundent. Qui ducis vultus et non legis ista libenter. Omnibus inuideas, liuide nemo tibi
Contributors: Malcior, of Worms
Series: German books before 1601 -- roll 604, item 15
Publisher: H. Quentel
Published: 1501
Place of publication: Colonie
Language: lat
Number of pages: 78
Subjects: Music theory
Notes: Colophon: (H⁵ recta): Explicit opusculu musices omnibus volentib[o] cantum vtru[n]q[ue] scire necessariu[m] fausto fine Impressum Colonie phonestu[m] viru Henricu[m] Quentel ciuem famatu[m] eiusdem Anno missionis in carne[m] diuini verbi. millesimo quinge[n]tesimo vno addito.

Signatures: A⁸,B⁴,C¹,D-E⁴,F⁶,G⁴,H⁶(last leaf blank)

The staves alone are printed for the musical examples of the third and fourth parts; they have been filled in with music notes in manuscript.

In four parts, of which only the first two, treating of music in general and of plainsong, are by Volcyr; the last two, dealing with measured music and with counterpoint, are by Malcior of Worms. Later completely reworked by the author and published as his Enchiridion musices ... de Gregorians et figurativa.