Dhritarashtra
Dhritarashtra (Skt. Dhṛtarāṣṭṛa; Tib. Yulkhor Sung; Wyl. yul 'khor srung; Eng. 'Defender of the Area') — one of the Four Great Kings. Guardian King of the East and chief of the gandharvas, the musicians of the heavens.
In a previous life he and Virudhaka were nagas. Filled with fear of the garudas, the great bird-like beings who prey on the nagas, they would not stir from the bottom of the ocean, but upon hearing of Buddha Kashyapa’s teaching, they took refuge in the Dharma. From then on their virtue protected them from harm and they lived, free of fear, on the ocean's surface.
Whatever sound he hears is turned back, causing harm to whoever produced it, therefore he covers his ears with his helmet and plays a stringed instrument so that he will not hear any other sounds.
For more details see Crystal Mirror, volume VI, Dharma Publishing 1984