John Kladas (Greek: Ιωάννης Κλαδάς Ioannis Kladas; fl. 1400) was a Byzantine composer. He had the post of lampadarius in the cathedral of Hagia Sophia of Constantinople. He wrote several works on the theory of music, the most important being the Grammatike tes mousikes (The Grammar of Music).^[1]

His daughter was a chanter and hymnographer, known only from one composition.^[2]

• Touliatos-Banker, Diane (Spring 1984). "Women Composers of Medieval Byzantine Chant". College Music Symposium. 24 (1): 62–80. JSTOR 40374217.
• Williams, Edward V. (2001). "Kladas [Lampadarios], Joannes". Grove Music Online. Revised by Christian Troelsgård. Oxford: Oxford University Press. doi:10.1093/gmo/9781561592630.article.15917. ISBN 978-1-56159-263-0. (subscription or UK public library membership required)

• Manuel Chrysaphes (1985) The treatise of Manuel Chrysaphes, the lampadarios: On the theory of the art of chanting and on certain erroneous views that some hold about it (Mount Athos, Iviron Monastery MS 1120, July 1458), in Monumenta musicae byzantinae, vol. 2, pp. 45, 79, 83 (snippets available)
• Apostolike Diakonia tes Ekklesias tes Hellados, Digitalization of Byzantine Music, Archive of Konstantinos Priggos. Archived 3 December 2013 at the Wayback Machine In Greek.

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