In this recording it's very hard to discover the exact bass notes during whole the piece. For example, is it:

Or rather:

I'm afraid I can't get the chords totally right. Frahm uses disharmonic sounds, but it's hard to find when and which one. As in measures 13. Or 37 and 39, 51 and 53: should they be the same or not?

You'll have to decide what you prefer to play, knowing that probably it isn't what Nils was playing..