Modern classical music is music written in the 20th century and beyond. Although much of it draws heavily on earlier forms, modern composers also experimented with rejection of long-held ideas; notably, Arnold Schoenberg questioned the traditional notions of harmony with his twelve-tone system[?], and John Cage questioned the very definition of music with his use of chance and found sounds.
... cases: nominative, vocative, accusative, instrumental[?], dative, ablative, genitive, and locative. It has over ten noun declensions.
Sanskrit has ten classes of ...