"Whatever will be, will be./ The future's not ours to see." Que Sera, Sera, the 1956 platter, may sound a bit soupy and syncopated today. But when Rock Star Sly Stone, 29, of Sly and the Family Stone, heard the mother of Record Producer Terry Melcher sing it at her very own piano, he was turned on.

He even decided to include an updated gospel version in his latest album, Fresh.

Terry's mother is of course Doris Day, 49. How did the Bad Guy of Rock and the Golden Oldie hit it off so well? "I told her, 'Sit down, girl.' I showed off," Sly explained. "She liked that. Yeah, she's very aware. She's very wise. Only thing--she started talking about the Baptist church, and she shouldn't do that."

As the celebration of the tenth anniversary of his pontificate began, Pope Paul Vl's "hobby"--as his entourage was calling his collection of contemporary art--was unveiled in 55 rooms of the Vatican Museum, the refurbished Borgia Apartment near the Sistine Chapel. Much of the show consisted of Italian paintings and massive sculptures by Giacomo Manzu and Emilio Greco. But there were also two rooms full of American paintings, one devoted entirely to works by Ben Shahn.

There was even a token nod to abstract art, which in the past Paul has publicly deplored. As if to underline not only the catholicity of the Pontiff's taste but the ecumenism of the anniversary, the Vatican announced that some donations for the U.S. collection had come from American Protestants and Jews.

For two years, Margaret Trudeau, 24, the pretty wife of the Canadian Prime Minister, has been more seen than heard from. But when she gave her first full interview as First Lady to the Toronto Star, Margaret turned out to be very much her own woman: "Even now that we're married, we still don't feel we possess one another. Pierre doesn't have any expectations for me to always be at his side, and I don't have any expectations of him to always be at mine." For now, however, Margaret's expectations center on her 18-monthold son Justin and a second baby due at the end of the year. Pregnancy? "A perfect time in a woman's life because it is just all happy, positive dreams."

Margaret was less positive about other subjects, especially politicians. After Trudeau's liberal caucus canceled plans for group yoga because of fears of adverse publicity, Margaret commented, "It would probably have cleared some dust out of their heads."

"He's extremely intelligent. He has so much common sense. He's become a sort of folk hero." Could it be that the lady praising Senator Sam Ervin was Novelist Mary McCarthy, whose tongue is generally sharp enough to crack ice at 30 paces? Indeed it was.

In Washington to cover the Watergate hearings for the London Observer, Mary became such a fan of Ervin's that she asked for a little talk with him. How had the Senator got his legal talent? she inquired. "He told me that he comes from a long line of lawyers from North Carolina--and one who practiced away." Where was that?

"South Carolina," the Senator answered. In her first dispatch, the Parisian expatriate, who once did a stint as theater critic for the Partisan Review, found some highly theatrical touches in "the rather shabby" marble-pillared Senate Caucus Room. She might even do a book on Watergate.

"The characters of the story, though," she added, "are very dull and basically uninteresting. Starting with Richard Nixon."

She was not permanently retired after all. Maria Callas, the volcanic soprano whose last role was Tosca at New York's Metropolitan Opera in 1965, explained that she had "developed some bad vocal habits. So I retired to start again." Now a worldwide Callas tour that would begin in the fall was being announced. For some time she has been moving back into music. Her voice has lost its reach, no doubt, but she still has a grasp of dramatic music to hold any audience in thrall. Callas will be heard only in concert, so the fascinated public will be spared those horrendous mezzo-tinted feuds with opera directors that were half the show. Unless Rudolf Bing should come from the wings to take on a job as her agent.

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