During the war years, Lang along with Robert Russell Bennett, Don Walker, and Ted Royal were recognized as the busiest orchestrators on Broadway.
[3] An early assignment were the original orchestrations for Irving Berlin's Annie Get Your Gun, in which Lang employed the new so-called "microphone technique" where the singer would carry the melody line without much support or competition from the orchestra.
He would later use this to excellent effect for Rex Harrison's speaking-singing on My Fair Lady, but belters like Ethel Merman expected full-bodied orchestral underpinnings.
Producer Richard Rodgers and the musical director Jay Blackton wanted the more traditional "live theater" sound and asked Russell Bennett to redo it during the tryouts.
Throughout his career Lang was a prolific arranger for bands and would often serve as a guest conductor and adjudicator for school festivals and clinics.
(1961), Dear World (1969), Applause (1970), Mack and Mabel (1974), Goldilocks (with Leroy Anderson) (1958) and Norman Lear's 1968 film The Night They Raided Minsky's.