Jack Jones, a crooner who beguiled concert fans and stage, screen and television audiences for decades with romantic ballads and gentle jazz tunes that even in large venues often achieved the intimacy of his celebrated nightclub performances, died on Wednesday in Rancho Mirage, Calif. He was 86.

His wife, Eleonora Jones, said the cause of his death, in a hospital, was leukemia.

While his popularity peaked in the 1960s, Mr. Jones found a new audience in later years singing the theme to the hit television show “The Love Boat.” But even then he seemed always to have stepped out of an earlier generation, one that dressed in tuxedos for the songs of Tin Pan Alley and reminded America of its love affairs with the Gershwins, Cole Porter, Sammy Cahn and Jimmy Van Heusen.

He won two Grammy Awards and recorded numerous albums of American Songbook favorites that hit the upper reaches of Billboard’s charts on the strength of his smooth vocal interpretations. He performed at Carnegie Hall, the Kennedy Center, the White House and the London Palladium, and for more than 60 years drew crowds to cabarets and nightclubs around the world.

At the Oak Room of the Algonquin Hotel in Manhattan in 2010, marking his 52nd year in show business, Mr. Jones opened and closed a two-hour retrospective of his songs with Paul Williams’s “That’s What Friends Are For.” He sang to a packed house of longtime fans:

Friends are like warm clothesIn the night air.Best when they’re oldAnd we miss them the most when they’re gone.

“Those lyrics evoked the vanishing breed of pop-jazz crooner, of which Mr. Jones and Tony Bennett remain the great survivors,” Stephen Holden wrote in The New York Times. “Mr. Jones, now 72, draws the same kind of well-dressed sophisticated audiences that used to attend the annual appearances at the defunct Michael’s Pub of his friend Mel Tormé, who died 11 years ago at 73.”

ImageMr. Jones with his fellow vocalist Tony Bennett in 1972.Credit...Central Press/Hulton Archive/Getty Images

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