John Joseph "Jay" Joyce is an American record producer, songwriter and session musician. In the 1990s, Joyce, with Chris Feinstein and Brad Pemberton, recorded and toured as Iodine and began working as a record producer, working with artists such as The Wallflowers, Emmylou Harris, Patty Griffin, White Reaper and Cage the Elephant. In the 2000s, Joyce began producing for Eric Church, Halestorm, Zac Brown Band, Brandy Clark, Amos Lee, Declan McKenna, Fidlar and Little Big Town. He has also played guitar for Crowded House, The Wallflowers, John Hiatt, Iggy Pop, Brendan Benson and Macy Gray.