1MileCrash said:
Mozart's Symphony #40 in G minor is the best sound I've ever heard - period. Anyone have any recommendations for other things I should check out?
If you want to stick with Mozart, try some of his concertos. My favorite is his clarinet concerto, which is truly sublime. Next would come some of the piano concertos, maybe #24 or #21. But it's hard to go really wrong with Mozart. I like the rest of his wind concertos a lot, too: horn, flute, oboe, bassoon. Oh, and the Sinfonia Concertante for violin, viola and orchestra (sort of a double concerto). When I get the opening bars in my head, I can't get it out for hours.
For someone similar to Mozart, try his contemporary Joseph Martin Kraus, the "Swedish Mozart." You can find a bunch of his stuff on the Naxos label.
When I started listening to classical music years ago (referring to the whole genre now, not just the Mozart/Haydn/Beethoven era), I started from a few different "centers" and worked my way outward to related composers that were mentioned in the notes on the backs of LPs (yes, I'm that old) and in books, magazine articles, etc.
For example, one place I started was with Beethoven, because it happened to be his bicentennial year (1970). He led me quickly to Haydn and Mozart, and then I went backward to Bach, Handel and Vivaldi, and forward to Mendelssohn, Schubert, Berlioz, etc.
Another place I started with was Sibelius, because a couple of my grandparents came from Finland. He led me to other Nordic composers from around 1900: Grieg, Nielsen, Stenhammar; and then backwards and forwards to earlier and (mostly) more contemporary composers from that region. This has always been my bigggest "specialty."