I attended Brigham Young University back in the 1970s (yep, it dates me), when the Osmonds and their television variety program — “The Donny & Marie Show” — were a hit. BYU students filled the audience seats at the Osmonds’ television studio, and Donnie and Marie and family put on a popular, high-energy musical show every week for three years, to the delight of screaming teens and young adults (and, no, I didn’t scream). And, when you think about it, the Osmonds’ longevity is pretty amazing — more than 50 years in show business, since the early days when the Osmond brothers were regulars on Andy Williams’ TV show.