Starting in the ’50s, the McGuire Sisters were one of America’s most popular vocal groups, their three-part harmonies a balm to audiences rattled by rock ’n’ roll.Starting in the ’50s, the McGuire Sisters were one of America’s most popular vocal groups, their three-part harmonies a balm to audiences rattled by rock ’n’ roll.Read MoreMcGuire, Phyllis, Deaths (Obituaries), Pop and Rock Music, Nineteen Hundred Fifties, McGuire Sisters (Music Group)