Leto and one of his Thirty Seconds To Mars bandmates were in an L.A. studio a couple of months ago trying to cook up some ideas for new music and thought Taylor was the perfect muse. Let's face it, the chick makes hits.
But here's why this video is amazing ... you see them listen to a bunch of 1989 tracks -- "Welcome to New York," "Blank Space" and "Style" -- and critique the music. They really dig Taylor's 16 count.
But frustration with capturing the Swifty sound eventually sets in, and Jared takes a shot ... we think at her music, not Taylor personally.
We're guessing they're somewhere listening to Adele right now.