Thanks for so many good suggestions. The selections I currently have under consideration for our upcoming listening session, which prompted the original post, will come from among the following works:
Zwilich: Symbolon or Concerto Grosso, Mehta/NYP, New World NW 372
Larrson: Concertino for Db & Str Orch, Wedin/OskarshamnEns, Fredin-db, Opus 3 8502
Rochberg: String Qt #3, Concord Qt, Nonesuch H 71283
Takemitsu: Rain Tree, Sugahara/Percussion Museum, Super Analogue 9207
or Piano Distance, Serkin, RCA ARL1-4730
Lutoslawski: Concerto for Orchrestra, Kletzki/OSR, London CS 6665
Bozay: Improvisations No 2, Bozay/Perenyi/Papp/Perenyi, Hungaroton SLPX 12058
Druckman: Aureole, Slatkin/StLouisSO, New World NW 318
Duarte, John: Idylle pour Ida, Alice Artz-gui, Hyperion A66146
Maw: Sonata for strings and two horns, Del Mar/EngChmOrch, Civil-hn, Argo ZRG 676
Wuorinen: Speculum Speculi, Speculum Musicae, Nonesuch H 71300
Kokkonen: Symphony No. 3, Berglund/Finnish Radio SO, Decca SXL 6432
Martin, Frank: Concerto for seven wind instruments, timpani, percussion, and string orchestra, Ansermet/OSR, London CS 6241
Imbrie: Three Sketches, Dempster-trmb, Aanerud-pf, New World NW 254
Tubin: Sym 4 (Sinfonia lirica), Jarvi/Bergen, BIS LP 227
Piston: Symphony No. 7 or 8, Mester/LouisvilleO, Louisville LS 746
Of course, we can't play everything and all is subject to change upon reflection. As usual, we will at least play whole movements if not entire works. My goal, as I've said, is to expose my friends to some music and composers they've perhaps not yet heard.