Only five genres are represented, though films from excluded genres such as musicals, westerns, and animation have not been omitted. Instead, they have been reclassified: Singin' In The Rain appears in the comedies section, Snow White becomes science-fiction, The Searchers is designated an action movie, and Citizen Kane is apparently a thriller.
Other lists of 500 films include Empire magazine's The 500 Greatest Movies Of All Time (2008) and The Telegraph newspaper's 500 Must-See Films (2013). (I've also compiled my own list of 500 Classic Films.) Total Film's previous film lists are: The 100 Greatest Movies Of All Time (2005), The Top 100 Movies Of All Time (2006), The 67 Most Influential Films Ever Made (2009), and 100 Greatest Movies (2010).