The Boston Modern Orchestra Project (BMOP), the nation’s premier orchestra dedicated exclusively to commissioning, performing, and recording new orchestral music, marks its 25th anniversary with its Carnegie Hall debut, April 15, 2023, at 8:00 p.m., on the Stern Auditorium / Perelman Stage. The ambitious program caps BMOP’s quarter-century celebration with three New York premieres commissioned, premiered, and recorded by BMOP: the Grawemeyer Award-winning pieces Play by Andrew Norman and A Thousand Mountains, A Million Streams by Lei Liang, and In medias res by Lisa Bielawa.