The Casanovas recorded their lead singer's song "I Don't Want You To Go" (Chester Mayfield) in 1955. This is the genesis of "Dedicated to the One I Love".
Originally The Royal Sons Quintet, The 5 Royals (Eugene Tanner on lead, Lowman Pauling, Jimmy Moore, Obadiah Carter and Johnny Tanner) were the first to record "Dedicated to the One I Love" (Pauling, Bass) in 1957.
In December of 1957 The Shirelles (Shirley Owens, Doris Coley, Beverly Lee and Addie Harris) released "Dedicated to the One I Love" and watched as it went nowhere. In January of 1961 it was re-released and it hit the top ten.
In 1967 The Mamas and the Papas (John and Michelle Phillips, Denny Doherty and Cass Elliott) hit the top five with "Dedicated to the One I Love" from the album "Deliver".