Feast of the Chair of Peter (in song)

In honor of today's feast of The Chair of Peter, here is a YouTube video, Tu Es Petrus (Thou art Peter) by Palestrina. The words are taken from the Gospel of Matthew chapter 16, verse 18, where Christ says to Peter,

And I also say unto thee, that thou art Peter, and upon this rock I will build my church; and the gates of Hell shall not prevail against it. ~Matthew 16:18

The video is a long one, and we only get to stare at poor Palestrina throughout, but it is worth turning up the sound and listening to it meditatively, as it is quite beautiful.