Barak-Kadan

From Memory Alpha, the free Star Trek reference.

Barak-Kadan was a Klingon opera singer of great renown during the 24th century.

He was a particular favorite of Worf's, who valued his traditional approach to opera and his strength of voice and intonation, and noted that there were "none like him." Jadzia Dax, however, found him boring because he never varied his performance even a "half-tone". (DS9: "Looking for par'Mach in All the Wrong Places")