SAX四重奏のための協奏曲なんてものを集めてみたけど、尖った曲は殆どなかった。編成がPOP過ぎるのかな。
3番目の作曲家の詳細が知りたい。ボリスと一緒で、血縁関係はない赤の他人なんだろうか。

Tristan Keuris(1946-1996) - Concerto for saxophone quartet and orchestra (1986)
https://www.youtube.com/watch?v=RJaSC1hxRX0

Philip Glass(1937-) - Concerto for saxophone quartet and orchestra(1995)
https://www.youtube.com/watch?v=MYkIrYh7zuw
https://www.youtube.com/watch?v=c9pUnqtc4-k
https://www.youtube.com/watch?v=5QmEKPNQjEs
https://www.youtube.com/watch?v=S_pNk3b7r6E

A. Tchaikovsky - Concerto for Saxophone Quartet and Orchestra
https://www.youtube.com/watch?v=KNZS1ozq7pw
https://www.youtube.com/watch?v=c8bYVoIh1PA

Menachem Zur(1942-) - Concertino for Saxophone Quartet and Orchestra
https://www.youtube.com/watch?v=ik3I350Eah4