 Les nuits d'été is a song cycle by a romantic composer who made significant contributions to the modern orchestra with what?
Les nuits d'été discography: Les nuits d'été ("Summer Nights"), Op. 7, is a song cycle by the French composer Hector Berlioz, setting six poems by Théophile Gautier. Hector Berlioz:  Berlioz made significant contributions to the modern orchestra with his "Treatise on Instrumentation".
i don't know