CAMBRIDGE - Must "new music" always be brand new? Presenting world premieres is naturally a bread-and-butter activity for an ensemble like Collage New Music. But this venerable group, now in its 37th season, also has broader goals in mind: tending reputations and keeping in circulation a substantial body of music by the composers it champions. That means works written yesterday, but also the day before yesterday.
And so it was at Monday's performance in the Longy School's Pickman Hall that four of the five works on the program were composed in the 1990s. Two pieces were by Andrew Imbrie, who died in December 2007 and was an important composer in the Collage pantheon, one of the few in that group who was not based in Boston. Music director David Hoose spoke at length from the stage about Imbrie and his work, praising the way the composer used a modern non-tonal idiom while still maintaining a deep consonance with the forms and expressive grammar of music's past. For Imbrie, the high-modernist dream of stripping away all links to the art form's history was never more than a chimera.