Kahless and Lukara

Kahless and Lukara was a celebrated Klingon opera depicting the story of Kahless the Unforgettable and his mate, Lukara, considered the greatest Klingon love story.

Quark had a holographic presentation of Kahless and Lukara in his library of holographic programs, which was enjoyed by his Klingon ex-wife, Grilka. (SS DS9 (... Loved I Not Honor More))

Worf was a fan of this opera, and would on occasion sing its arias. (SS DS9 (The Devil You Know)) Kaga, the proprietor of the Klingon restaurant on Deep Space Nine, also would perform selections from the opera for his customers.