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I'm removing the precise dates left by an anon editor (1135 - 1201 for Leonin, and 1160 - 1205 for Perotin). The only sources on these two composers are the later writings by Anonymous IV and Johannes de Garlandia, and neither gives biographical details on either man; even their actual names are not known. There have been numerous conjectures on the dating of their works but evidence is scanty. Please present your sources if you believe I am wrong; perhaps there is something very recent I haven't seen. Antandrus 01:44, 4 Aug 2004 (UTC)