Background: The 5th Dimension is an American popular music vocal group, whose repertoire includes pop, R&B, soul, jazz, light opera and Broadway--the melange was coined as "Champagne Soul." Formed as The Versatiles in late 1965, the group changed its name to the hipper "The 5th Dimension" by 1966. They became well-known during the late 1960s and early 1970s for their popular hits: "Up, Up and Away", "Stoned Soul Picnic", "Medley: Aquarius/Let the Sunshine In (The Flesh Failures)", "Wedding Bell Blues", "Never My Love", "One Less Bell to Answer", "(Last Night)
Context: In the early 1960s, Lamonte McLemore and Marilyn McCoo got together with three friends from Los Angeles -- Harry Elston, Lawrence Summers. and Fritz Baskett -- to form a group called 'the Hi-Fis' (which later became 'the Vocals'). In 1963, they sang at local clubs while taking lessons from a vocal coach. In 1964, they came to the attention of Ray Charles, who took them on tour with him the following year. He produced a single by the group, "Lonesome Mood", a jazz-type song that gained local attention. However, internal disagreements caused Elston to go his own way, eventually leading to his forming the Friends of Distinction, with latter day Hi-Fis member, Floyd Butler.  McLemore sought to form another group and started looking for members to join him and McCoo. McCoo, who had studied with the respected vocal coach Eddie Beal, had appeared in high school and college musical productions and was known for her way with a torch song. McLemore found Florence LaRue, who had received training in singing, dancing, and violin; and who won the talent portion at the Miss Bronze California contest, which McLemore was assigned to photograph. (McCoo had won the contest the prior year.) About the same time LaRue was approached to join the group, McLemore recruited an old friend, Ronald Townson, who at age six was singing in choirs and gospel groups in his hometown of St. Louis, Missouri. His grandmother fostered his career by arranging for private voice and acting lessons as he grew up. In his teens, he toured with Dorothy Dandridge and Nat King Cole, joined the Wings Over Jordan Choir, and played a small part in the film Porgy and Bess. He demonstrated his skill as a classical artist by placing third in the Metropolitan Opera auditions held in St. Louis. After finishing high school, he worked his way through Lincoln University by conducting the school and church choir. After graduating, he organized his own 25-member gospel choir.  Another of McLemore's friends from St. Louis days, Billy Davis Jr., started singing in gospel choirs at an early age. He later saved enough money to buy a cocktail lounge in St. Louis, which he used as a base for experimenting with musical groups. When asked to join McLemore's new group, he agreed, while hoping for a solo contract from Motown.
Question: Who taught them singing lessons?

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