Sentence:  A biting , pithy parable of the all pervading hollowness of modern life , the piece has been set by Mlle Lagoon to a sumptuous score ( a single motif played over and over by four thousand French horns ) by existentialist <WSD>hot-shot</WSD> Jean-Paul Sartre . 
Meaning of the word marked with <WSD> tags:  someone who is dazzlingly skilled in any field