EXCLUSIVE: After a long Oscar-laden movie partnership with his brother, Ethan Coen makes his solo and documentary debut on the A24 film Jerry Lee Lewis: Trouble In Mind, which premieres at Cannes tonight. He and wife/editor Tricia Cooke made this one while brother Joel Coen and his wife Fran McDormand were off making The Tragedy of Macbeth. Here, Ethan Coen describes the allure of making a free form docu on the firebrand singer/pianist behind hits like Great Balls of Fire. Coen worked closely with T Bone Burnett, the music man extraordinaire who collaborated with the Coens on Inside Llewyn Davis. And when the Coens will put the band back together and make another together.