This is the main riff:
[ Tab from: http://www.guitaretab.com/g/ghostland-observatory/204755.html ]
e|---------------------|---------------------|
B|---------------------|---------------------|
G|---------------------|---------------------|
D|-----5---------------|-5h7-7h9-5h7---------|
A|-5h7--7-5--5-5h7-----|-------------5h7-----|
E|----------7-7--------|---------------------|
Near the end (from 3:04 to 4:15) you would just play:
e|------|
B|------|
G|------|
D|-9----|
A|-7----|
E|------|
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