The source material is almost unbearable in its specificity: £45 per enslaved person, catalogued alongside corn and fish by Lloyds of London in 1779. A captain mourning a chair, not the woman bound to it and thrown overboard. David Önaç's Atlantic Requiem was commissioned to do what archives cannot — not record what happened, but make you feel the weight of its bureaucratic indifference. Önaç's structural conceit is quietly brilliant: the piano's black and white keys become a symbolic binary, opposition and potential reconciliation pressed into the instrument's architecture. Jazz and blues syncopation bleeds into Latin requiem mass, Gregorian chant dissolves into what Önaç calls bureaucratic recitative — the sung banality of administrative evil. These are not decorative moves. They are argument by form. The premiere, conducted by a last-minute substitute in Malcolm J Merriweather, was staged at LSO St Luke's with the London Symphony Orchestra, an expanded BBC Singers, and three soloists: Brittany Renee, J'Nai Bridges, and tenor Orson Van Gay II. Merriweather navigated the piece competently, but the venue was the wrong size for the project — too intimate for forces this large, which buried the soloists behind the orchestra at precisely the moments they needed to cut through. The work's high point is its finale: a convulsive, rhythmically dense dance emerging after the Agnus Dei's choral stillness. Önaç earns that contrast. The problem is pacing — he compresses an enormous amount of material into a short span, and the result feels rushed where it should breathe. This is a full-length work constrained into something shorter, and the seams show. There is a tension running through Atlantic Requiem between the ambition of its architecture and the limitations of this particular performance context. The piece is clearly still under construction — premiered, but not finished in the way that a major work needs to be finished before its ideas can fully land. Önaç is a serious compositional talent doing serious work. He needs a larger premiere, a hall that fits his forces, and probably another fifteen minutes of running time. What exists already earns attention. What it could become is the more interesting question.