The Digital Tradition has

ONE BOTTLE OF POP
ONE DAY AT A TIME, SWEET JESUS
ONE DIME BLUES
ONE ELEPHANT
ONE FINE DAY
ONE GRAIN OF SAND
ONE HOUR MAMA
ONE MAN SHALL MOW MY MEADOW
ONE MAN'S HANDS
ONE MEATBALL
ONE MEATBALL (2)
ONE MILLION LAWYERS
ONE MISTY MOISTY MORNING
ONE MORE DAY
ONE MORE DAY 2
ONE MORE PARADE
ONE MORE RIVER
ONE MORNING IN MAY
ONE NIGHT AS I LAY ON MY BED
ONE O'CLOCK THE GUN WENT OFF
ONE PIECE AT A TIME
ONE SHIP DRIVES EAST
ONE SURE THING
ONE TIME ONLY
ONE TIN SOLDIER
ONES THAT GOT AWAY

only a few of which have been proposed on this thread.