After setting forth the requirements of original authorship and fixation
in a tangible medium, section 102(a) as originally enacted in 1976 goes
on to itemize a number of subject-matter categories for works of
authorship, which “shall include” literary works, musical works, dramatic works, pantomimes and choreographic works, PGS (pictorial,
graphic, and sculptural) works, motion pictures and other audiovisual
works, and sound recordings. “Architectural works” were added in
1990. Most of these categories of works are defined in section 101. Although Congress did not intend these listed categories to exhaust its