Although sometimes referred to in newspaper coverage as a revue, What Is It? was actually a musical comedy. The Sydney Morning Herald indicates in this respect that the production was staged over two acts and dealt 'chiefly with a mesmerist, a snobbish duke, a gay young peer, a musical comedy actress and an American salesman "doing" London' ('What Is It' 4 December 1915, p.19). The first act is set in the house of Sarazo the mesmerist and the second act in the reception room of the Hotel Cecil, London.
Among the songs incorporated into the show were: 'We're Proud of You Boys' (sung by Valerie Hewett and chorus), 'The Ragtime Dream,' 'The Beautiful Sea' and 'The Sleepy Pyjama Girl.' The dances included an Egyptian ballet and the picturesque 'Desert Dance.'