I suppose it depends on your mood, or the mood you want to induce. Personally, I think the most evocative piece of music I've ever heard is the Fantasia on a theme of Thomas Tallis, composed by Ralph Vaughan Williams, which in my mind conjures a vivid image of the English countryside between the two World Wars; although it was written in France during the first World War. For something completely different, though of a similar vintage, go for Bolero, by Maurice Ravel, preferably the version by the Montreal Symphony Orchestra. If you're old enough to remember a certain sporting event associated with Bolero, then you might also like another short-ish piece that springs to mind, used by the same sporting couple, namely Capriccio Espagnol, by Nikolai Rimsky-Korsakov. If you want to be soothed try some Indian classical sitar music ... honestly, it works! These suggestions, and those from other AB people barely scratch the surface, of course, but give 'em all a try ... I've been listening to 'classical' music (anything from the 12th century onwards) for 50 years, and I'm still discovering 'new' stuff.