The collaboration between Billy Joel and Kevin Spacey primarily involves Spacey performing Billy Joel’s songs on stage, including a well-known duet on “New York State of Mind” at Madison Square Garden in 2017 and a tribute performance of “Piano Man” at the Library of Congress Gershwin Prize for Popular Song ceremony in 2014, where he played harmonica and sang. Spacey also had a special relationship with the Gershwin Prize event, which he hosted before performing.