Ambrose stayed at the May Fair for six years, during which time the band made recordings for Brunswick Records, HMV and Decca. He teamed up with Richard Rodgers and Lorenz Hart, along with an American harmony song trio, the Hamilton Sisters and Fordyce (aka Three X Sisters), to record songs including "My Heart Stood Still" among others. This period also saw the musical development of the band, partly as a result of Ambrose's hiring of first-class musicians, including Sylvester Ahola, Ted Heath, Joe Crossman, Joe Jeannette, Bert Read, Joe Brannelly, Dick Escott and trumpeter Max Goldberg.