Films are often divided into genres, which describe the typical subject matter -- what the film is about. This is distinct from film styles, which describes filmic conventions which can be applied to any genre. Of course, the more that genres are defined, the more likely that a filmmaker will try to combine, transcend and evade categories, so not every film can be neatly labeled.
... with the early sound heavily influenced by Kesey's LSD-soaked Trips Festivals[?]. This early period is covered in Tom Wolfe's "The Electric Kool-Aid Acid Test." ...