The Museu de la Música de Castelldefels is a free museum dedicated to the history and evolution of music. It showcases a diverse collection of musical instruments, sheet music, and audiovisual materials that highlight the cultural significance of music in Castelldefels. Visitors can explore the different sections of the museum, including exhibits on classical music, traditional Catalan music, and contemporary music. The museum also hosts live performances, concerts, and music workshops, providing a vibrant and immersive experience for music lovers.