Goddess's Harp

The Goddess's Harp is an instrument that originally belongs to Zelda in Skyward Sword, which is eventually used again by Sheik in Ocarina of Time.

Ocarina of Time
In Ocarina of Time, the lyre is played by Sheik to teach Link various warp songs. Each time Sheik takes the lyre out, he plays the melody on it first before Link follows along on his ocarina. The lyre used by Sheik has the same design as the Goddess's Harp used by Zelda in the prequel, Skyward Sword.

Skyward Sword
The Goddess's Harp in Skyward Sword originally belongs to Zelda, although Link eventually receives it and uses it during his adventure. Zelda is first seen holding it when she jumps down to Link after his victory in the Wing Ceremony. The Harp will make use of the Wii MotionPlus in order to play it, and it will be the main instrument of the game.