Composer Brothers

The famous Composer Brothers of Kakariko Village created the Sun's Song and gave their lives to protect it. Read each of their headstones and be prepared to fight each brother to learn his part of this information. The younger brother is Flat, and the older Sharp. They also make an appearance in MM, where Sharp has sold his soul to the devil, and sealed his younger brother inside of an Iron Knuckle. After you defeat Flat, he teaches you the Sun's Song, which you can use to cleanse Sharp's soul, and make the river flow once more in Ikana Valley.