Classical Music Compositions from 1940 and later - Vinyl only


This is the theme for the next music listening gathering of our local group and I'm looking for suggestions. This is a vinyl only listening session, so new music available only on digital are excluded. Yes, I know that is limiting, but that's the way it is for this listening session. 

A few pieces I've been thinking to bring from my collection, just starting from the "As",  are:

Adams, John - Harmonium, for large orchestra and chorus - De Waart/San Francisco SO - ECM 25012
Alwyn - Str Qt 2 (1975) - Quartet of London - Chandos ABRD 1063
Alwyn - Symphony No. 2 - Alwyn/LPO - Lyrita SRCS 85
Arnold, Malcolm - Pf Trio, op54 - Nash Ensemble - Hyperion A66171
Arnold, Malcolm - Overture to Tam O'Shanter, Op51 - Eiji Oue/MinnO - Reference Recordings RM 2510
Bernstein - Serenade for Violin Solo, Strings and Perc - Bernstein/SymoftheAir, Isaac Stern, vn - Columbia

What music on LP would you recommend? 
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128x128rushton
Oh, so YOU"RE the other guy who actually bought and listened to "Smiley Smile...?"  I'd been wondering for all these years and now I'm a little less lonely.
I saw the Beach Boys on tour (my 3rd BB show) after the release of this LP and they totally ignored the music on it.  Still, a great show.

Correction:  they did play "Good Vibrations," which was a hit single included on the LP.
. . . . . and I guess I'm the THIRD GUY who bought the Smiley Smile album?   I also was lucky enough to have a good friend drag me to Brian's live "Smile" concert (in Phoenix) when that album was finally released a few years ago . . . . 
learsfool, I agree with you completely about including  Lou Harrison, Elliot Carter,  Roy Harris, Walter Piston, Carl Ruggles and Charles Ives in any list of great 20th Century American composes. All should be explored by music listeners with any interest in recent classical music.

As you can see from my lists, my focus is not just American composers. I'm really interested in exposing some friends to some of the less well known composers from the second half of the century. But many of the names you've listed are not well know and should be better known.