Parece que Hulce tocou piano para o papel, mas foi assim que seu desempenho seria mais convincente. A trilha sonora em si foi pré-gravada, eu aposto para garantir a autenticidade. Aqui está um trecho de uma entrevista com Hulce da People Magazine em dezembro de 1984 :
Although the movie's sound track was prerecorded with professional musicians, Hulce really is pounding out those notes. "It was my job to have it all seem effortless and believable," Hulce says. "I never knew when the camera was going to be on my fingers." Before going to Prague for filming, Hulce hired a piano teacher. "I spent four weeks, four to five hours a day learning to play. The first two days were scales and exercises. The next day was a concerto." All that hard work had an unexpected payoff. "It helped me understand Mozart," claims Hulce. "How someone could write from morning to dark, then go out and drink and dance and carry on. The energy from my piano playing got me all revved up to go out and trash myself."