It may be a coincidence that the choreographer Mark Morris has devoted this nation’s 250th anniversary to dances to American music, but the Seattle native is a pure product of America. He’s American in his empirical, iconoclastic approach to music, disregarding its accrued meanings for what he hears in the score. He’s American because irony comes easily and is a conduit of sincerity. He’s American for speaking plainly when he’s being profound and for making you feel, not think. The Mark Morris Dance Group and Music Ensemble ends its American year with one recent and three repertory works. For the 2025 Northwest, the choreographer turns to the composer and longtime Alaskan John Luther Adams for an adaptation for harp and percussion of Indigenous Alaskan dances. In their walking pace and the glow that the notes sustain long after they’re struck, the short numbers bring to mind the late composer and gamelan devotee Lou Harrison, whose music drove Morris to forge a bewitching bond between force and poignancy. In the masterpiece Jenn and Spencer, to another West Coast maverick, Henry Cowell, the equally unlikely bond is between tenderness and ferocity. Two early pieces, to Gershwin piano preludes and to popular song, complete the rich program. —Apollinaire Scherr