Música de ayer.

Laura Gayán, a young singing student, is secretly in love with Carlos, Count of San Telmo, and she lives in his palace because his father is the porter. Stephen, a fellow student, drinker and womanizer, attempts to seduce her, taking advantage of the girls' sentimental bad situation due to the recent news of the wedding of his beloved. Eventually, Laura gets a contract to make "small forms" and, against her heart, she married Stephen. Meanwhile, dissolves the marriage of Charles ...