I've no idea why you should think this or why you would assume all peoples on a hifi forum would have an interest or enjoy classical music. It's not like there's not any other genres too be interested in.
In my modest collection of music I have work ranging from Ella Fitzgerald (I think that's the only 'Jazz') , some Blues, Rock 'n' Roll, Pop, Psychedelia, Motown, Soul, Rock, Heavy Rock, Heavy Metal, Punk, New Wave, Indie, Electronica, Thrash, Grunge, Trip hop, Singer/songwriter, Drum & Bass, Dance, Country and the odd film soundtrack.
I've always tried to take an open minded approach to music in general but I've always preferred music with a Lyrical content, though it's great when an artist is a virtuoso on a given instrument it doesn't always follow that makes an Artist "great" imho, it's really important that they actually have something to say and an individual sound. I've always found in most genres that there's a few that really stand out and lots of wannabees and copy cats.
I will try Mahler's 4 and Beethoven's 7, any recommendations for particular Orchestras or conductors of these?