"Cats" is completely told through music with no dialogue in between the songs, although there are occasions when the music accompanies spoken verse. Lloyd Webber's compositions employ an eclectic range of musical styles so as to magnify the characters' contrasting personalities. For example, the rebellious Rum Tum Tugger is introduced with a rock song ("The Rum Tum Tugger"); the fallen Grizabella is accompanied by a dramatic operatic aria ("Grizabella: The Glamour Cat"); Old Deuteronomy makes his grand entrance to a lullaby-turned-anthem ("Old Deuteronomy"); and Gus' nostalgia for the past is reflected through an old-fashioned music hall number ("Gus: The Theatre Cat"). Many of the songs are pastiches of their respective genres, which Snelson attributes to the show's origins as a song cycle: