The home planet of the Qomar, a technologically superior and intensely mathematical people who have never heard music until Voyager's Doctor sings for them and becomes a planet-wide sensation.
The Qomar homeworld is visited in Virtuoso. The Qomar are far ahead of the Federation in technology and treat Voyager's crew with open condescension, until some of them hear the Doctor singing in sickbay. Music is unknown in their culture, and they are captivated by its mathematical structure.
Voyager is invited to the planet, where the Doctor performs opera to packed halls, is mobbed by admirers and has miniature holographic likenesses made of him. Encouraged by the scientist Tincoo, he resigns his commission in order to stay.
Tincoo then builds a new hologram with a vocal range no human singer could match, and the audience's interest in the Doctor ends at once. He returns to Voyager, chastened, and asks for his post back.