She was born in Barcelona and studied composition with Francesc de Paula Sánchez i Gavagnach and violin with Agustí Torelló.
[2] Casagemas' opera Schiava e regina won a prize at the World Columbian Exposition in Chicago in 1892; it has to be performed in 1893 at Gran Teatre del Liceu, Barcelona; it would be the first opera by a woman performed there.
However, an anarchist attack with a bomb interrupted the opera season and the theatre was closed for months.
Afterward Casagemas sang her own compositions at the salon of novelist Emilia Pardo Bazán, and he introduced her to musical and literary society.
[3][4] Casagemas composed over than 300 works, solo and chamber music and songs with piano.