Loved Beethoven since a child - particularly the 'Pastoral'. So much of his is actually whistleable, rollicking stuff.
Wagner, J S Bach, Mozart - all have something to touch the soul or stir the heart... that said, somewhat disappointed in a rather big collection of Debussy's works that I bought recently.
Apart from Eddie Elgar, can't find much among British composers that's to my taste, especially Birtwhistle - come ON! What IS that all about? Even Britten doesn't feel memorable to me, but then, what do I know?
Classical music training aside, it's a bit like art: you might not know much about it, but you know what you like. And why that's a phrase always sneered at by so-called cognoscenti, I don't know. You don't generally buy artwork you can't stand, unless you're Charles Saatchi and just buy the exhibition en bloc in the hope that some of it's going to prove profitable. So why not give credit to popular works and their creators? Just because people love certain works, and they're played a lot, doesn't make them less worthy than some discordant, esoteric piece we're informed by 'experts' is 'exquisitely creative'.
(That's enough. You were just asked what classical music you liked, not to go off on a bleedin' rant. Get back to cleaning the office. Ed.)