From the YouTube page:

Please share this video to help The Tallis Scholars celebrate the 500th Anniversary on Sunday 26 March 2017 of Heinrich Isaac. The music is the first part of Isaac’s majestic ceremonial motet “Virgo prudentissima”. Our aim is for as many people as possible to listen to Isaac’s music on the exact anniversary of his death. The Tallis Scholars’ album of music by Isaac can be downloaded from iTunes and streamed on Apple Music and Spotify, just search for “Heinrich Isaac”.

… and yes, this composer is new to me.

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