He collaborated on some of his most famous songs with lyricists Al Dubin, Billy Rose, Mack Gordon, Leo Robin, Ira Gershwin and Johnny Mercer. In 1942 the Gordon-Warren song "Chattanooga Choo-Choo", as performed by the Glenn Miller Orchestra, became the first gold record in history. It was No.1 for nine weeks on the "Billboard" pop singles chart in 1941–1942, selling 1.2 million copies. Among his biggest hits were "There Will Never Be Another You", "I Only Have Eyes for You", "Forty-Second Street", "The Gold Diggers' Song (We're in the Money)", "Lullaby of Broadway", "Serenade In Blue", "At Last", "Jeepers Creepers", "You're Getting to Be a Habit with Me", "That's Amore", and "Young and Healthy".