Rêverie is one of Claude Debussy's early and most famous piano works, composed around 1890. The title translates to "Daydream" or "Reverie," perfectly capturing the piece's flowing, contemplative, and improvisatory character. While not as radical as his later works, Rêverie already shows signs of the harmonic innovation and atmospheric quality that would define musical Impressionism. Its serene and melancholic melody has made it a enduring favorite, frequently arranged for various ensembles, including the brass quartet version referenced here.