I have a fair bit of classical music in 5.1 - the SACD was much more readily accepted in that world, and lives on there - but the surround mixing tends to be ambient concert hall in the rears, rather than the kind of thrilling, inventive organic sound you'd get from Elliot Scheiner or any of the greats who've mixed for popular music. It's less of an artform, more a pleasant bonus.
That said, the 2L Nordic Sound disc is simply the best-sounding BDA I've ever heard.The 2L guys are recording in the highest res possible, and really know what they're doing. I don't know why we need BDA and SACD in the same package (give one to a friend?), but as hi-res surround system demo discs go, this one's a keeper.
Karlos Kleiber's legendary early 60s recordings of Beethoven's 5th & 7th with the Vienna Philharmonic are so widely thought unsurpassable that Deutsche Gramophon reissue them on every new format that arrives. They kept improving the CD versions, then there was SACD 2.0, followed shortly by SACD 5.1 (I like to think after complaints about the lack of 5.1 on the first SACD).
The only surprise about seeing it on HFPA BDA is that it appears to be the 2.0 version, from what I can tell (release info is so patchy and unreliable with HFPA). As they have created a 5.1 mix already, and there is huge space available on these discs, it's just mystifying. Given that they promised 5.1 "where possible" on HFPA, this is either incompetence, stupidity or plain laziness. I'm not replacing any discs I already have in hi-res surround - Beck, Derek & The Dominoes, etc. - with HFPA versions, and most certainly not if they have reverted to 2.0 for this format. If you do buy the Kleiber, let me know what you think, especially if I'm wrong about it being 2.0.
Unlike Karajan - who was obsessed with recording technology (and would have loved BDA) - Kleiber almost never allowed himself to be recorded, believing the live performance was a unique event shared between himself, the orchestra and audience, so he's an unlikely source for an audiophile recording. The engineers he reluctantly let in that night at the Sofiensaal must have known what they were doing though and, whilst there are better-sounding classical recordings in existence, the music is completely electrifying.