Career

'went on to become one of the "most useful and faithful servants of the l’Opéra-Comique".[2]'

I recommend deletion of the French definite article "l’" as it repeats the word "the." However I hesitate to edit a quotation since I don't have access to the original. I cannot imagine that the definite article would have been duplicated like this in the original French, so I guess it's an error in the translation.