Some context: Hunter was born in New York City, the son of Gertrude (nee Gelien) and Charles Kelm. His mother, from Hamburg, was a German Roman Catholic immigrant, and his father was Jewish. Hunter's father was reportedly abusive, and within a few years of his birth, his parents divorced. Tab grew up in California with his mother, older brother Walter, and maternal grandparents, John Henry and Ida (nee Sonnenfleth)
Hunter had a 1957 hit record with the song "Young Love," which was No. 1 on the Billboard Hot 100 chart for six weeks (seven weeks on the UK Chart) and became one of the larger hits of the Rock 'n' Roll era. It sold over one million copies, and was awarded a gold disc by the RIAA.  He had the hit, "Ninety-Nine Ways," which peaked at No. 11 in the US and No. 5 in the UK. His success prompted Jack L. Warner to enforce the actor's contract with the Warner Bros. studio by banning Dot Records, the label for which Hunter had recorded the single (and which was owned by rival Paramount Pictures), from releasing a follow-up album he had recorded for them. He established Warner Bros. Records specifically for Hunter.  Hunter's acting career was also at its zenith. William Wellman used him again in a war film, Lafayette Escadrille (1958). Columbia Pictures borrowed him for a Western, Gunman's Walk (1958), a film that Hunter considers his favorite role.  Hunter starred in the 1958 musical film Damn Yankees, in which he played Joe Hardy of Washington, D.C.'s American League baseball club. The film had originally been a Broadway show, but Hunter was the only one in the film version who had not appeared in the original cast. The show was based on the 1954 best-selling book The Year the Yankees Lost the Pennant by Douglass Wallop. Hunter later said the filming was hellish because director George Abbott was only interested in recreating the stage version word for word.  He also starred in They Came to Cordura (1959), with Gary Cooper and Rita Hayworth. Sidney Lumet starred him opposite Sophia Loren in That Kind of Woman (1959).
When did his music career start?
A: Hunter had a 1957 hit record with the song "Young Love,"

Some context: Sir Reginald Carey "Rex" Harrison (5 March 1908 - 2 June 1990) was an English actor of stage and screen. Harrison began his career on the stage in 1924. He served in the Royal Air Force during World War II, reaching the rank of flight lieutenant. He won his first Tony Award for his performance as Henry VIII in the play Anne of the Thousand Days in 1949.
Harrison was born at Derry House in Huyton, Lancashire, the son of Edith Mary (nee Carey) and William Reginald Harrison, a cotton broker. He was educated at Liverpool College. After a bout of childhood measles, Harrison lost most of the sight in his left eye, which on one occasion caused some on-stage difficulty. He first appeared on the stage in 1924 in Liverpool. Harrison's acting career was interrupted during World War II while serving in the Royal Air Force, reaching the rank of Flight Lieutenant. He acted in various stage productions until 11 May 1990. He acted in the West End of London when he was young, appearing in the Terence Rattigan play French Without Tears, which proved to be his breakthrough role.  He alternated appearances in London and New York in such plays as Bell, Book and Candle (1950), Venus Observed, The Cocktail Party, The Kingfisher and The Love of Four Colonels, which he also directed. He won his first Tony Award for his appearance at the Shubert Theatre as Henry VIII in Maxwell Anderson's play Anne of the Thousand Days and international superstardom (and a second Tony) for his portrayal of Henry Higgins in the musical My Fair Lady, where he appeared opposite Julie Andrews.  Later appearances included Pirandello's Henry IV, a 1984 appearance at the Haymarket Theatre with Claudette Colbert in Frederick Lonsdale's Aren't We All?, and one on Broadway at the Brooks Atkinson Theatre presented by Douglas Urbanski, at the Haymarket in J. M. Barrie's The Admirable Crichton with Edward Fox. He returned as Henry Higgins in the revival of My Fair Lady directed by Patrick Garland in 1981, cementing his association with the plays of George Bernard Shaw, which included a Tony nominated performance as Shotover in Heartbreak House, Julius Caesar in Caesar and Cleopatra, and General Burgoyne in a Los Angeles production of The Devil's Disciple.
what was his first performance
A:
He acted in the West End of London