Duet with Kina

He will ask Link to comeback at night. So go ahead and sleep on the first floor bed and wait until night. Once you wake up, talk to Pumm and he will tell you to play your harp with his Kina. Once this begins you must simply play the harp to the rhythm to the bar’s customers. When the customers are not swaying their arms you can play however you like. If you successfully complete this then Link will get another heart piece.

Story

After Link obtains the Goddess Harp from Zelda in the Temple of Time, Pumm will request that Link accompanies Kina while she sings for the guests. In order to accomplish the task, Link has to strum his harp with the swaying of one of the customer's arms. After successfully accompanying Kina during her performance, Pumm will inform Link that he doesn't have to work for him anymore, and rewards the hero with a Heart Piece. Like the previous task, Link can come back at night and play the harp along with Kina again any time to receive Rupees depending on how well he performs.

Muscle Technique When they move their arms you strum your harp from one side to the other. Make sure to play the edge strings. When they move their arms faster you play you're harp faster. Basically have you're hand on the harp in the direction their pointing. (Note: you don't have to go the same direction as them but it's easier) When they stop moving their hands try and keep the normal tempo.