intro guitar riff:
E|---------------------------------------------| |
B|-------1---------0----------1---------0------| |
G|-----2---2-----0---0------2---2-----0---0---.| |
D|-0h2-------0h2--------0h2-------0h2---------.| |
A|---------------------------------------------| |
E|---------------------------------------------| |

during the second time around during this riff, another guitar plays a
lot of harmonics on the high strings at the 5th fret, kinda like this:

E|-<5>--------------------<5>-----------------|
B|-----<5>-----<5>------------<5>-------------|
G|---------<5>-----<5>-----------<5>----------|
D|---------------------<5>--------------------|
A|--------------------------------------------|
E|--------------------------------------------|
while this isn't exactly what is played, it's the gist of it. listen to
the song to hear how much to do the harmonics...

verse:
(Am) (during the first few lines of the verse)
 C C/B Am ("that had not yet appeared")

(during that C-C/B-Am progression, more of the 5th-fret harmonics are
played.)

chorus:
G D C Bm Em

bridge:
G F Em D
G F Em Em