"It ain't necessarily so |s (fake book)" . "209504" . "209504 65073 GERSHWIN, GEORGE GERSHWIN, IRA It ain't necessarily so |s (fake book)" . . . "65073" . "GERSHWIN, GEORGE" . . "It ain't necessarily so |s (fake book)" . . "209504" . . "GERSHWIN, IRA" .