May I suggest Mozart? His music is brilliant. I use Mozart to teach the principles of Composition. Every Melody has a “hook”, like the best crafted jazz melodies that one can’t forget.
Eine Kleine Nachmusik, His piano Sonatas, and The Magic Flute are terrific.
If you are coming from a Heavy metal background, I suggest the Russians. Moussorgsky, Borodin, and Rimsky-Korsakov will knock your socks off!
FReep me for more suggestions if you like.
You haZ mail ;)