Aleatory music is a type of composition where certain elements of the music are left to chance or are improvised. Synonyms for aleatory music may include indeterminate music, chance music, or improvisational music. These terms all refer to the same general idea of music that is not entirely predetermined by the composer, but instead allows for a certain degree of unpredictability or spontaneity. Another related term is avant-garde music, which refers more broadly to experimental and innovative styles of music that push the boundaries of traditional music theory and composition. Regardless of the terminology used, aleatory music offers a unique and exciting listening experience that challenges our expectations and perceptions of what music can be.