[Gm 악보와 음원] [Dm 악보와 음원]
https://www.youtube.com/watch?v=8HiGEslPSfw
https://www.youtube.com/watch?v=0iy-ABG4FUw
https://www.youtube.com/watch?v=lV9FD4PVkts
https://www.youtube.com/watch?v=_eXr9OjsWjs