The Mountain tab by Trevor Hall

Tabs

Tuning: Standard

e|--------------------------------------------------------------------------|
BB|-----3-----3-----3-----3-----3-----3-----3-----3-----3-----3-----3-----3--|
G+G|----0-----0-----0-----0-----0-----0-----0-----0-----0-----0-----0-----0---|
D MajorD|--------------------------------------------------------------------------|
A augmentedA|--------------------------------------------------5-----5-----5-----5-----|
E MajorE|--3-----3-----3-----3-----3-----3-----3-----3-----------------------------|

e|--------------------------|
BB|-----3-----3-----3-----3--|
G+G|----0-----0-----0-----0---|
D MajorD|--------------------------|
A augmentedA|--2-----2-----2-----2-----|
E MajorE|--------------------------|

That's all it is. This is just played repeatedly throughout the entire song.
It's really easy to pick up on, just play it next to the song once or twice.