From Our Catalog:
Suspiria (videorecording), 1977
The terrifying first chapter of Dario Argento's "Three Mothers" trilogy, Suspiria is the tale of mysterious goings-on at a German dance school. When an American student becomes suspicious of the school's headmistress and decides to investigate, things only get weirder. Argento's trademark vivid colors and campy, bloody murders, often associated with the Giallo genre, have made this a horror classic.
Argento's IMDB biography gives a good overview of his life and works. A more in-depth analysis of his older works and the Giallo style can be found in this Film Quarterly article, available through the library's Jstor database (Free Library of Philadelphia card is required to view).