OoT] Fun Fact: the in-game ocarina is an actual instrument that can play real songs. This page from the Official Nintendo Player's Guide explains how it works, and gives you the inputs
Start Menu - Undertale | Ocarina tabs, Piano songs sheet music, Undertale music
The Legend of Zelda: Ocarina of Time - Song of Storms | VGLeadSheets.com - Lead Sheets for Video Game Music