Music history lesson of the day

Listen to this song. It'll sound familiar. But keep in mind, this song was written first. Here are the lyrics. Now, maybe, like most things, I'm the last guy to know about this, but I thought it was pretty interesting.

Attention my erstwhile colleagues in the Brown Madrigal Singers: y'all should sing this song. It'll blow the audience's mind. And educate 'em, too. Oh, and while I'm giving you unasked-for advice -- your programs should include the lyrics to the songs. It'll make your audience much happier.