His beautiful music allows him to travel to the Underworld unharmed.
Explanation:
Orpheus is a character in one of the best known Greek myths. He played the harp and was a very talented musician, able to enchant and convince all humans with his music. One day he falls in love with a woman named Eurydice, who also loves him. One day she is bitten by a snake and ends up dying. Orpheus is desperate and decides to go and get her in the underworld.
When going to the underworld he takes his harp and succeeds through music, passing by the boatman, the three-headed dog and even convincing Hades to free him and his beloved unharmed from the underworld.