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
A few composers I have been listening to who are all still alive. There are many more but these three happen to come to mind.
Aaron Jay Kernis
George Tsontakis
Valentin Silvestrov
However, Ives actually used quite a bit more of American folk tunes than Copland did, and was very original, experimenting with bi-tonality pretty much before anyone else did, and with quarter-tones, etc.
Learsfool, you make some very instructive observations about Ives' music. Thank you. I would not disagree with your and frogman's comments. And, I think I still enjoy listening to Copland! :-)

Jetrexpro, thank you for offering the names of three contemporary composers whose music I don't know. I'm stuck in this time warp of very few new music recordings since the advent of digital recordings because I've continued to maintain a vinyl-only listening room. Sigh... This simply points out that I'll have to look at how to supplement my listening. Streaming media, I suppose - will have to sort out how I want to do that. 
By the way, I offer a big "Thank you" to all who've participated in provided suggestions and engaging in some conversation about MUSIC for a change. How refreshing is that!?!
For small form (simple songs) I think the most American of composers is Stephen Foster, hands down.  He wrote My Old Kentucky Home, Beautiful Dreamer, I Dream of Jeannie with the Light Brown Hair, Oh Susannah,  Old Folks at Home (Swanee River), Hard Times Come Again No More, Old Black Joe and Camptown Races.  Gershwin excelled in both shorter songs and larger works such as Rhapsody in Blue and Porgy and Bess.  Both men gave us a good measure of very American music.