De Cantu ad Missam. [Lambeth folio 49a:1]
When þe Procession was gon,
Þe Messe bygan sone anon:
Line 11,260
Þer myghte men se fair samninge
Of þo clerkes þat best couþe synge,
Wyþ treble, mene, & burdoun,
Of mani on was ful swete soun;
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Of þo þat songe heye & lowe,
& þo þat couþe org[a]nes blowe,