Barbara mentioned Shelley Posen's "Fa-Sol-La." The song itself is entirely about a type of music (Sacred Harp) it includes a portion of Showers of Blessings, and I am pretty sure makes internal reference to several more Sacred Harp tunes.

Rick Fielding has also recorded it. He sings it with the Showers of Blessings reference, but leaves out actually singing it. I guess 'cause he could not do a 4 part fuge solo.