Aired on CBS Radio Network October 4, 1955 .The McGuire Sisters were a singing trio in American popular music. The group was composed of three sisters: Ruby Christine McGuire (July 30, 1926 – December 28, 2018) Dorothy "Dottie" McGuire (February 13, 1928 – September 7, 2012) Phyllis Jean McGuire (February 14, 1931 – December 29, 2020) Among their most popular songs are "Sincerely" and "Sugartime", both number-one hits.