I would like to know the sites

For an extended listing and description of largely classical LPs with superior sound:
http://www.high-endaudio.com/index_ac.html - see "Supreme Recordings"

For an online resorce to reviews of various classical recordings (largely CD):

http://www.gramophone.co.uk - go to "Reviews"; you'll have to register, but otherwise access to an extensive database of reviews over the past 10 years or so is available.

http://www.classicaldigest.com - an extensive list

http://www.hifiplus.com - see "The Reviews" and work through the back issues from there.

Thanks Rushton!
I added them to my links too!

Great response Rushton -- very useful. Thanks.

Elizabeth and Ozfly, you're welcome. Glad I could share. One additional comment: as a collector of vinyl, I find Grammophone particularly useful because the reviewers often reference other performances by way of comparison that are (or were once) available on vinyl.

Two more resources that you might explore are:

http://www.bbc.co.uk/radio3/building/index.shtml - the ever valuable BBC "Building a Library" recommendations

http://www.classicstoday.com

Rushton,thanks a lot for your replies. I am sorry that I asked an incorrect question. I would like to know Q&A sites about classical discs. I make once more request for it. Thanks.