Collaborating with lyricist Eddie DeLange, on songs such as "Heaven Can Wait", "So Help Me", and "Darn That Dream", his work became more prolific, writing over 60 songs in 1940 alone.
Berkolaborasi dengan penulis lirik Eddie DeLange, pada lagu-lagu seperti "Heaven Can Wait", "So Help Me", dan "Darn That Dream", karyanya semakin produktif, menulis lebih dari 60 lagu pada tahun 1940 saja.