He does not perform with orchestras anymore, as he was never satisfied with the result. None of his collaborative concerts and only a handful of solo recordings were committed to plastic. The nonesuch from Petersburg, however, performed Rachmaninov's 3rd, rigged, at least thrice: with Ollila (SRSO), Gergiev ('89 Mariinsky), and Tortelier ('95 BBC SO), according to Lykhin. These recordings, like many of his recorded but unreleased concerts, circulate the net in under-bitrated MP3s . I would cough up some serious sovereigns to obtain a decent, non-mp3, version of the EPIC Tortelier recording, and I can barely afford a happy meal. (At least I was told this is the Tortelier one; I am referring to the recording with the audience unrestrainedly applauding after the first movement).
This recording (the one with unrestrained applause after first movement) is probably with Tortelier and BBC (see data right below). These mp3s were found online, and never released on CD. There are 2 other non-officially-released recordings of Rach 3 with Sokolov. This is the best one imho. If somebody has the original uncompressed files of this recording - PLEASE UPLOAD THIS SOMEWHERE AS FLAC/APE !!! This is an epic recording of Rach 3 !!!
=== Sergey Rachmaninov Concerto for Piano No. 3 in D minor, Op 30
Grigory Sokolov soloist BBC Philharmonic (pre-1983, BBC Northern SO; 1983-91, BBC Philharmonic Orchestra) Yan Pascal Tortelier conductor Royal Albert Hall, London on Thursday 27 July 1995 at 7:00PM. The Proms 1995 ===
here is the info about the 3 Rach recordings by Sokolov, including this one from http://www.lykhin.com:
Sergey Rachmaninov Piano Concerto No. 3 d-moll, op. 30 Grigory Sokolov (BBC Symphony Orchestra, Yan Pascal Tortelier) Sokolov - Radio Recordings (Tchaikovsky, Rachmaninov piano concertos) 1999 46:36 MP3 160 bps
Sergey Rachmaninov Piano Concerto No. 3 d-moll, op. 30 Grigory Sokolov (Stockholm radio symphony orchestra, Toumas Ollila) Sokolov - Radio Recordings (Tchaikovsky, Rachmaninov piano concertos) 46:08 MP3 160 bps
Sergey Rachmaninov Piano Concerto No. 3 d-moll, op. 30 Grigory Sokolov (Mariinsky Theater Orchestra, Valery Gergiev) Sokolov - Radio Recordings (Tchaikovsky, Rachmaninov piano concertos) 1989 44:11 MP3 160 bps