@ubertrout has given an excellent summation of the artistic merits of the albums in this batch of releases, but I just wanted to add a few things:
All the Columbia albums (
Firebird, Rite of Spring, Wooden Prince, Dance Suite, Haydn 93 & 94) feature quad mixes by Ray "
Bitches Brew" Moore, aside from
Haydn 95 which is a Larry Keyes mix, so these should all be agressive mixes, in classical terms.
This batch of discs completes the "stealth release" of two full quad LP's. The bonus material on the
Wooden Prince disc,
Dance Suite, is from Masterworks MQ 31368 - the other half of this LP (
The Miraculous Mandarin) is on the Dutton Epoch release
Boulez Conducts Bartok: Concerto for Orchestra (
CDLX 7360) from November 2018. The bonus material on the
Bernstein Conducts Haydn 93 & 94, Haydn 95 is from Masterworks MQ 32598 - the other half of this disc (
Haydn 96) is the bonus material on the Epoch release of
Bernstein Conducts Hadyn: Mass in Time of War (
CDLX 7346) from October 2017.
The Firebird (
MQ 33508)
, The Rite of Spring (
M 34557)
and The Wooden Prince (
M 34514) were all SQ-only LP releases, so these discs represent the debut of the discrete mixes for all three of these albums.
The Rite of Spring album, from 1978, was one of CBS's very last quad releases of any type, coming nearly a year after their final pop quad releases.
I'm not sure who did the quad mix of the
Die Todt Stadt opera (it was a co-production between RCA and German radio, and the sleeve only credits a German engineer I've never heard of) but the two Ormandy albums were both engineered by Paul Goodman, who did most (if not all) of Ormandy's other RCA quad albums. So, I expect these are of a similarly high calibre - especially given that the original
Also Sprach Zarathustra LP sleeve carried the subtitle "An Awesome Sonic Experience," suggesting that it was sort of RCA's equivalent of the Columbia Masterworks LPs that boasted of being "A Quadraphonic Spectacular." The Saint-Saens half of the disc features Virgil Fox, who I understand was sort of like RCA's version of E. Power Biggs - although funnily enough, I did come across an interview with him recently where he was chiding Biggs for being too much of a traditionalist in his arranging and playing - so if you're fond of those 'Man with a huge organ' (ha ha) types of classical albums this one might be up your alley.