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.
... of the urethra:
Hypospadias[?] is a form of abnormal development of the urethra in the male, where the opening is not quite where it should be (it occurs lower than ...