The moment I keep returning to is three minutes into the first improvisation — a low cluster in the left hand that Jarrett holds, pedal down, while the right begins tracing something that sounds less like melody than like searching. The Köln Concert, recorded live at the Cologne Opera House in January 1975, is a record I have heard perhaps forty times, but I put it on last night through headphones rather than speakers for the first time in years, and it became a different thing.
On speakers, the room fills — you hear the audience, the piano's overtones spreading into the hall. Through headphones, what comes forward is how thinly Jarrett was threading the needle that night. The piano was reportedly in poor condition, the action stiff, the lower register dull; he has spoken about this. What he does in response is stay largely in the middle and upper registers, constructing arcs that sometimes break into gospel-adjacent repetitions, sometimes into something close to minimalist pulse.
I read this as resourcefulness rather than concession. The gospel phrases — and there are many — arrive not as quotation but as load-bearing structure: something repeated until it resolves, or until it earns the right to move. The form is improvisation, but it works by accumulation the way theme-and-variation works, each return slightly altered by what the music has done in between.