The text seems to be a title that is humorous due to its absurdity, combining an unlikely character (Ethel the Aardvark) with an unexpected and mundane profession (Quantity Surveying), followed by an even more incongruous addition ('...the Musical!'). However, it does not exploit different meanings of a word or similar-sounding words for its humor.
Ethel the Aardvark Goes Quantity Surveying . . . the Musical !