Twenty-one years ago, when Hanson released one of the earwormiest singles of the ’90s, the Jackson 5-reminiscent “MMMBop,” the song was summarily dismissed by many music snobs as a novelty...

On Hanson’s first hit single, “MMMBop” — which went to No. 1 in 27 countries, was nominated for two Grammys, and helped the brotherly trio’s major-label debut Middle of Nowhere...