Nothing's gonna ever keep Link down!
The Legend of Zelda: Majora's Mask was full of secrets and hidden activities, but I think we really missed out on a Daniel LaRusso-style training montage here. The above clip and the one after the break demonstrate Link's tutelage by a rather touchy-feely Great Fairy. I'm assuming she's trying to teach the drum technique.
Majora's Mask Unused Cutscene (3) [YouTube]