Alvarez has also composed several comedies, such as "Los musiquillos de Bremen" based on a story from Julio Babrusquinas, "Lisístrata", "Venus y Adonis" (an electroacoustic opera which consists on the adaptation of the homonim poem from William Shakespeare by Armando Suárez del Villar), he has also conducted the "Cantoría Infantil del Teatro Lírico Nacional de Cuba", for which he produced several musical comedies such as "Las aceitunas", "Siempre caperucita" and "El flautista de Hamelín".