Describe the story Hadero tells to explain why birds are considered to have played an integral part in Ethiopia's musical origins.

Hadero tells a story of a boy who was born in the Empire of Aksum 1500 years ago. His name was Yared. When he was seven his father died.

The story goes on until when one day that boy was sitting under a tree busy in his studies. There three birds on the tree taught him musical tones. Those scales which he learned from those birds, he used to compose music in Ethiopia.