Atmosfarag
Umphrey's McGee
Tab by Eric S w/ updates from The Spinal Shaft

Main Riff
--------------------------------
--------------------------------
-9-----6------------------------
---------------7----------------
-7-----4------------------------
---------------5----------------

played over these chords (keep playing the octaves on the 5th of each chord)
A > F#m > D
A > F#m > D
A > F#m > E
A > F#m > G

The G sounds pretty good like this
-----
--3--
--0--
--0--
--X--
--3--

       Fm      C#   Fm  Bbm                             Fm   C#     Fm   Bbm
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
-----10----------10--------------------------10----------10---------------------
-/10--------11--------8-----------------/10--------11---------8-----------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

       Fm      C#    Fm   C#  Fm  Bbm             Fm     C#    Fm     Bbm
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
-----10----------10--------10----------------10----------10---------------------
-/10--------11--------11--------8-------/10--------11----------8-----------------
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

Do all that twice, then repeat this for a bit...
C#m/G# G#
-----------------------------------------
-----5---5---5---5----------------------
-----6---6---6---6---5-5---------------
-----6---6---6---6---6-6-----------4-6-
----------------------6-6-------4-6-----
-4---4---4---4---4--4-4----------------

That's about it, go back and do the main riff again and you're done.