‘Sumer is icumen in’ – a perpetual puzzle-canon?

@article{Wulstan2000SumerII,
  title={‘Sumer is icumen in’ – a perpetual puzzle-canon?},
  author={David Wulstan},
  journal={Plainsong and Medieval Music},
  year={2000},
  volume={9},
  pages={1 - 17}
}
  • D. Wulstan
  • Published 1 April 2000
  • Education
  • Plainsong and Medieval Music
When I was an undergraduate attempting to write canons, it would have been convenient to have known that composers cheated. By the time I was a don, in turn trying to teach undergraduates to write canons, I now had this knowledge, though I would doubtless have called it ‘composers' expertise’; but, unfortunately, I was still not aware of the precise way in which this expertise was employed. Later, I found out that many canons (such as those of Bach's ‘Goldberg Variations’) were written on the… 
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References

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A Possible Celtic Provenance for the Reading Rota
  • Miscellania Musica Celtica: Musicological Studies
  • 1968
A General Collection of Ancient Irish Music (Dublin, 1803), as cited by Travis, 'A Possible Celtic Provenance