Classical 2 die 4...top 5?

I have greatly enjoyed the posting 'Audiogon recordings to die for'. My tastes tend to run to Jazz and Pop with a big focus on acoutical (non-electically produced mucic...what is it supposed to sound like in the first place?) So I owned or have purchased several of the top listed pop and jazz recordings on the list.

I would like to get more exposure to classical music. Most of the classical recordings have heard up to now usually sounds shrill, harsh and thin. Can some of you make your "absolute TOP 5 no one should be without" list of classical music? I can't wait, thanks in advance.