The McGuire Sisters were an American singing trio formed in the 1950s, consisting of sisters Phyllis McGuire, Dorothy McGuire, and Christine McGuire. They gained fame for their harmonious vocal style and popular hits like "Sincerely" and "Sugartime." The group became a staple on television and in live performances, showcasing their talent and charm. The sisters were known for their distinctive matching outfits and engaging stage presence. They enjoyed a successful career throughout the 1950s and 1960s, earning numerous awards and accolades. Their influence on pop music and vocal harmony remains significant in American music history.