From The New York Times:

“BALLPARK SONGS Paul McCartney and Billy Joel have played together at Citi Field, but it is Billy who gets the singalong every eighth inning when the loudspeakers play “Piano Man” — an odd choice redeemed a bit by the presence of a cheery Terry Collins on the scoreboard during the line “The manager gives me a smile.” As upbeat ballpark songs go, it is hard to beat McCartney and the Beatles belting out “Kansas City/Hey Hey Hey Hey,” which plays at Kauffman Stadium after every Royals win. The Beatles opened with that song when they played at the old Municipal Stadium in 1964.”