Flat is one of the Royal Composer Brothers. He is the younger brother, and he wears green robes.
Ocarina of TimeEdit
In Ocarina of Time, Sharp and Flat guard the Royal Family's Tomb. Inside it lies their life's work, the Sun's Song. They will attack Link if he examines their graves.
In Majora's Mask, Flat has been imprisoned beneath the Ikana Graveyard by his brother, Sharp. When Link finds him, he helps Link remember the Song of Storms, which can be used to break the curse on his brother, Sharp.