Clearly, it's a totally improvised piece: so this is a loose transcription of the harmonic movement, rather than "what it is".

This follows my personal convention of notating things. ~ C.

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from start to 38s
A^add♭2,4 → f^maj. → g^min.

39s to 1min 10s
low register chromatic clusters → g

1min 11s to end
54 Gm / / E♭ / | Dm / / Cm Cm⁄b♭ | A^maj7(♭5) | ⁱⁱF♯⁄g
54 Gm / / E♭ / | Dm / / Cm / | A^maj7(♭5) | ⁱⁱF♯⁄g
54 A^maj7(♭5)| ⁱⁱF♯⁄g | ⁱⁱF♯⁄g | ⁱⁱF♯⁄g ||