And I have my list, all strictly less than 20 years old:

Tsontakis: Dove Descending
Rouse: Violin Concerto, Kabir Padavali, Gorgon
Adams: Nixon in China, My Father Knew Charles Ives
Currier: Microsymph
Heggie: Dead Man Walking
Nelson: Passacaglia
Golijov: Yiddishbbuk
Birtwistle: Orpheus, Gawain
Kernis: Air
Corligliano: Red Violin Chaconne
Ades: Asyla
Helwig: Dvojnik
Davies: Orkney Wedding and Sunrise
Liebermann: Piccolo Concerto
Gubaidulina: Aleluia
Schnittke: Cello Concerto #1
Aho: Symphony #10
Daugherty: Violin Concerto

Someone is undoubtedly writing a great work as you read this!

Jeff Dunn
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Alameda, CA