ATLANTIC
tune high E string down to C#. Or don't and just ignore and mute that string. (every string down a half step)
The opening riff/chorus part is a Csus5 (D string is muted) chord that slides around, with the high E (now a C#) ringing out as a drone. It starts at the 10th fret (use pinky to move B string up two frets for opening riff), slides to 5th fret and then 2nd (B string open). Wait out intro and come in with the rest of the band.
Verse "Oh beautiful": C chord. Don't strum high E string. Then right away strum again but with B string open, plus the high C#.
Short break in verse after singing. Strum C chord but leave out low C (it's kind of an A minor at the same time, so . . . ) and with the B string frettted at the 3rd fret. Pulls away to open B, then strums at first fret (C), open to B quick and fretted again at 3rd. Way easier than it looks written down.
When the guitar opens up and drops out as we swing into the end part, and bass takes over, I just take my hand off and let it float for those four bars. Then it's a C chord, but all the action is on the B string. All pull-aways/hammer-ons: D C B C B C D C B C B C D C B C . . . repeat. You could maybe play this sometimes and goof around part of the time. When it kicks in it's Csus5, but the B string goes B C B C B C B C B C over and over til the drums double up and then that tricky riff above plays over the chord for the second half. Back and forth. Ends on Csus5.