LSO is first-rate here
...It probably always is. Anyway, the feeling of depth in this recording is vast, which makes it prime impressionism. Do NOT get the Naxos recording of the Nocturnes -- even from the preview clips I could hear the relative flatness and lack of dimensions. You must be able to discern the difference between subtle choral music and "mood music" (or whatever they're calling it these days) to enjoy Debussy's works that include vocals. If this makes no sense to you, try Vivaldi or something.