Francisco Alonso was a Spanish composer who lived from 1887 to 1948. He's best known for his work in zarzuela, a uniquely Spanish genre that's like a mix of opera and musical theater. Alonso wrote a ton of popular zarzuelas in the early 20th century, including some of the titles you mentioned like "La Calesera" and "La Parranda". He was a big deal in the Madrid theater scene and helped keep the zarzuela tradition alive during his time.