"It ain't necessarily so |s (fake book)" . . "245800" . "GERSHWIN, GEORGE" . "It ain't necessarily so |s (fake book)" . . "245800" . "46081" . . "GERSHWIN, IRA" . . "245800 46081 GERSHWIN, GEORGE GERSHWIN, IRA It ain't necessarily so |s (fake book)" . .