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, including "Sincerely" and "Sugartime." The sisters became a staple on television and in live performances, showcasing their talent across various platforms. Known for their matching outfits and engaging stage presence, the McGuire Sisters contributed significantly to the pop music scene of their time. They were often featured on shows like The Ed Sullivan Show and enjoyed a successful career that spanned several decades, leaving a lasting impact on American music.