First Listen: Matthew Morrison and Elton John's Duet, Er, Mashup

Matthew Morrison's duet with Elton John sounds a little familiar. In fact, a lot familiar.
That's because the collaboration is actually a mashup (of course it is, right, Gleeks?) of John's hits "Mona Lisa and Mad Hatters" and "Rocket Man."

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Ryan Seacrest premiered a clip of the tune, which will be on Morrison's upcoming debut album, on his radio show Monday. (The track is available on Amazon.com on Tuesday.) The pair recorded the song in January after Morrison asked John to be on the album.
"He gave me free reign, and it took me three days to go through his whole collection because he's got so many songs," Morrison told ET Canada. "[But] it's a beautifully epic seven-minute song, and it's my favorite song on the album."
Listen to the track below. How does it compare to "Summer Rain"?