American Idol 2019 Finale: Katy Perry sings “Unconditionally” with Jeremiah Lloyd HarmonKaty Perry & Jeremiah Lloyd Harmon Perform "Unconditionally" - American Idol 2019 Finale.May 20, 2019 by Jessie Mendoza Katy Perry and Jeremiah Lloyd Harmon perform her hit “Unconditionally” in front of a live audience at the American Idol 2019 Grand Finale. Katy Perry & Jeremiah Lloyd Harmon Perform “Unconditionally” – American Idol 2019 Finale.