I'd wager that these recordings sound better than any modern recordings on redbook CD, never mind that they are themselves legendary performances.

On the Living Stereo  Label (RCA/BMG):

Bartok - Concerto for Orchestra/Music for Strings, Percussion and Celesta. Chicago Symphony, Fritz Reiner, rec. 1955.  82876 61390 2

Brahms - Piano Concerto No.1, Artur Rubinstein, Fritz Reiner, Chicago Symphony rec. 1954   82876 66378 2

Ravel - Daphnis et Chloe, Charles Munch, Boston Symphony, rec 1955  82876 61388 2

Sibelius/Glazunov/Prokofiev - Violin Concertos, Jascha Heifitz, Reiner, Chicago Symphony rec 1959, 1963  82876 66372 2

R. Strauss - Also Sprach Zarathustra, Ein Heldenleben, Reiner, Chicago Symphony rec. 1954  82876 61389 2

Tchaikovsky - Symphony 6, Pierre Monteux, Boston Symphony, rec 1955

On Sony - probably now deleted as Sony seem to have stopped releasing SACDs on their own native label:

Copland - Appalachian Spring + others, Leonard Bernstein, NY Phil, rec 1960.   SS87327

Mahler - Symphony 1, Bernstein, NY Phil, rec 1967  SS7069

Stravinsky - Rite of Spring & Firebird Suite, Columbia Symphony Orch conducted by Stravinsky himself, rec 1962?  SS89062