In 1945, Jenkins joined Decca Records. In 1947, he had his first million-seller with "Maybe You'll Be There" featuring vocalist Charles LaVere and, in 1949, had a hit with Victor Young's film theme "My Foolish Heart", which was also a success for Billy Eckstine. At the same time, he regularly arranged for and conducted the orchestra for various Decca artists, including Dick Haymes ("Little White Lies", 1947), Ella Fitzgerald ("Happy Talk", 1949, "Black Coffee", 1949, "Baby", 1954), Billie Holiday ("Crazy He Calls Me", "You're My Thrill", "Please Tell Me Now", "Somebody's on My Mind", 1949, and conducted and produced her last Decca session with "God Bless the Child", "This Is Heaven to Me", 1950), Patty Andrews of the Andrews Sisters ("I Can Dream, Can't I", 1949) and Louis Armstrong ("Blueberry Hill", 1949 and "When It's Sleepy Time Down South", 1951).