Most of my suggestions involve works for full orchestra, but there's been some beautiful music composed for smaller forces(generally referred to as "chamber music"). Debussy and Ravel each composed only one string quartet, but they got it right the first time, and their quartets are regarded as among the most beautiful ever written. They're featured along with Debussy's haunting Syrinx for solo flute and Ravel's Introduction and Allegro which adds a clarinet and harp to the ensemble for added gorgeousness, on this scandalously low-priced disc , recorded fairly close-up, but with nice ambience added by the church recording venues(and best heard with the ambience extracted to the surrounds where it belongs with DPLII, etc.).

MDT Music is having a sale on Universal(Decca, DG, Philips)2-disc sets which lets us get these for about $7.80 plus about $1.10 shipping. At these almost give-away prices many of the sets are highly attractive, but at this time I'll specifically recommend an excellent Dvorak collection which includes the Slavonic Dances, American Suite, Czech Suite and others, performed by Dorati with the the Detroit Symphony and Royal Philharmonic. Over two hours of glorious music.