 While a student, he performed on the Contrabass with dance bands, and some of these jazz and pop elements can be seen regularly in his Broadway arrangements.In the 1960s, Brohn began his career as conductor for the Joffrey Ballet, American Ballet Theatre, and the Royal Ballet's tours of America.He then focused on orchestration during the next two decades, producing ballet scores for Agnes de Mille, Lar Lubovitch, Twyla Tharp, Susan Stroman and the American Ballet Theatre.