'The 'devil dances' - so-called by most writers and commentators upon Tibet - are really nothing more than religious morality dance-dramas, which, by taking their themes from the Holy Scriptures and the legends of the sainted ones, seek to drive home theological precepts through the medium of the allegory.'
Source of Descriptive Information
Harrison, F. (1936). Through forbidden Tibet: an adventure into the unknown. London: Jarrolds. (p. 57).