During the first bit with Thom on his own, it's
(G#min)How come I end up where I started
How come I end up where I belong
(C#min)Won't take my eyes off the ball again
(D#min)You reel me out the you cut the string(C#min)
Then it becomes
(G#min)You used to be alright(C#)
(D#min)What happened?
and those three chords are repeated.
Then suddenly (G#), (C#min), (G#) which becomes a (G#min)
Those same three chords repeated again.
(G#min)You used to be alright(C#)
https://www.coveralia.com/acordes/15-step-radiohead.php
(D#min)What happened?
Then (solo)
(G#min),(C#min),(D#min),(C#min) (repeated)
(G#min)How come I end up where I started, how come I end up where I belong
(C#min)Won't take my eyes off the ball again
(D#min)You reel me out the you cut the string(C#min) (i.e. same as beginning)
The song finishes on a (Cmin).
Hope you like these. Please tell me if there's a mistake.