A Song For Tomorrow (1948)

aka: Song Of Tomorrow

Derek Wardwell (Shaun Noble) is struck with amnesia, and the last thing he remembers is the beautiful voice of opera singer Helen Maxwell (Evelyn Maccabe). When he regains consciousness, Wardwell thinks he's in love with her. After his amnesia is cured, Wardwell returns to his fiance while Helen begins a romance with his doctor. Also with Christopher Lee.