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Robbins Landon, is a Largo e sostenuto in D minor, and stares straight at its kin in Beethoven, the brooding Largo e mesto of Op.

And humor, as when vibrato-rich sostenuto in the violins is interrupted by a belching low note from the cello.

It had only recently ended up at the Steinway factory in Astoria, Queens, a place of wood and felt and cast iron and the mechanical parts needed for music to happen: agraffes, backchecks, sostenuto rods and dozens of others.

Just one work on the bill at this free pop-up concert, with beer on hand, but a rewarding one: “Allegro Sostenuto,” a clarinet trio by Helmut Lachenmann, the central influence on so much music written in the past few decades.

The program opens with Hans van Manen’s 1973 “Adagio Hammerklavier,” which, set to the astounding adagio sostenuto movement of Beethoven’s “Hammerklavier” sonata, is an odd addition to the repertory.