Staircase Mystery

Guitar One Intro:
e|-----------|
B|-----------|
G|-----------|
D|-----------|
A|---7-8-7-5-|
E|-5---------|

Guitar One Intro B/Chorus:
e|-x/12--12--12--x12--12--12--12--12\-|
B|-x/13--13--13--x13--13--13--13--13\-|
G|-x/14--14--14--x14--14--14--14--14\-|
D|-x/14--14--14--x14--14--14--14--14\-|
A|------------------------------------|
E|------------------------------------|

Guitar Two Intro B/Chorus:
e|-1-1-1-1/-3-3-3-3-|
B|-1-1-1-1/-3-3-3-3-|
G|-2-2-2-2/-4-4-4-4-|
D|-3-3-3-3/-5-5-5-5-|
A|------------------|
E|------------------|

Guitar Two Intro B/Chorus Part 2:
e|-10-10-10-10-xx-10-10-10-10-xx-10-10-10-10-xx-10-10-10-10-|
B|-11-11-11-11-xx-10-10-10-10-xx-11-11-11-11-xx-10-10-10-10-|
G|-12-12-12-12-xx-10-10-10-10-xx-12-12-12-12-xx-10-10-10-10-|
D|----------------------------------------------------------|
A|----------------------------------------------------------|
E|----------------------------------------------------------|

Guitar Two Verse:
Not sure about this part. It's quite hard to hear what's going on.
McKay sometimes omits the root (single notes before the chord).
e|---8----9-----5------|
B|---8----10----5----8-|
G|---8----11----5----9-|
D|---10---11----7----9-|
A|------9----------7---|
E|-8----------5--------|

Guitar One Verse:
Plays after guitar two.
e|----------------------------------|
B|----------------------------------|
G|----------------------------------|
D|----------------------------------|
A|---7-8-7-5---7-8-7-5---7-8-7-5--5-|
E|-5---------5---------5----------5-|

Guitar Three (12 string) verse:
e|-------------------------|
B|-------------------------|
G|-------------------------|
D|-2-----2-----2-0---2-0---|
A|---3-0---3-0-----0-----0-|
E|-------------------------|
 
| /   slide up
| \   slide down
| h   hammer-on
| p   pull-off
| ~   vibrato
| +   harmonic
| x   Mute note
| b   Bend
| pb  Pre-bend
| br  Bend release
| pbr Pre-bend release
| brb Bend release bend