Harp of Ages
From Zelda Legends Wiki
A mystical time traveling instrument, belonging to Nayru, the Oracle of Ages. It can be found in the basement of Nayru's House, in the present. It has three different powers, available by playing three different songs. The first, the Tune of Echoes, allows you to travel back and forth through time, via the small time portals located on the ground. The second, the Tune of Currents, allows you to warp to the present from anywhere in the past. The third, the Tune of Ages, allows you to travel freely through time.