Sentence:  Claude Jannequin 's vocal description of a battle ( the French equivalents of tarantara , rum-tum-tum , and boom-boom-boom are very picturesque ) <WSD>is</WSD> lots of fun , and the singers get a sense of grace and shape into other chansons by Jannequin and Lassus . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)