Final answer:
The appropriate preposition to fill in the blank is 'à' and the sentence means 'One can listen to the best jazz in New Orleans.'
Step-by-step explanation:
The appropriate preposition to fill in the blank in the sentence 'On peut ecouter la meilleure de jazz __ la nouvelle orleans' is à.
So the sentence should be 'On peut ecouter la meilleure de jazz à la nouvelle orleans.'
This sentence means 'One can listen to the best jazz in New Orleans.' The preposition 'à' is used to indicate location or destination.
Learn more about Prepositions in French