Among the traditional instruments played by Coreyah there is the Daegeum 

This bamboo flute used in traditional Korean music has a unique vibrational sound generated by its composition. Thanks to the variety of bamboo and the manufacture of each instrument, it obtained a different tonality. In its history, there have been two great masters: the first one is Jeong Yak Dae, who would climb a mountain every day to practice the instrument. The story tells that when he finished a piece (of about six to seven minutes long) he would put a grain of sand inside his shoe and would not come down until he had hilled it completely. The second one was Park Jong Ki, a devoted son from Jindo island in South Jeolla, Korea. He was the creator of the sanjo, an instrumental solo for the Daegeum, which is still used today.