It's in drop D.
e|------------------------------------------------------------------------------|
B|------------------------------------------------------------------------------|
G|------------------------------------------------------------------------------|
D|--------------------------------------------------2---------------------------|
A|-3s5--5----3s5--5----3s5--5---3s5--5---0----3---------------------------------|
D|-0----0----0----0----0----0---0----0------------------------------------------|
[ Tab from: https://www.guitartabs.cc/tabs/b/brown_bird/bilgewater_tab.html ]
e|-------------------------------------------------------------------------------|
B|-------------------------------------------------------------------------------|
G|-------------------------------------------------------------------------------|
D|---------------------2--2--2--2--2--2--2--2------------------------------------|
A|-3s5--5----3s5--5----0--0--0--0--3--3--4--4------------------------------------|
D|-0----0----0----0--------------------------------------------------------------|
e|------------------------------------------------------------------------------|
B|------------------------------------------------------------------------------|
G|------------------------------------------------0-----------------------------|
D|-----0----3-----5--3------3---3-5-3-2------2------2-------2----2-3-2-0--------|
A|---5----5----5----------5---5---------0---0---0------0---0---0----------------|
D|-0--------------------0-----------------0--------------0----------------------|
There's a third part:
D5
"if the sun was always shining and our load always light"
G5
"we'd be shaking like a leaf with every god given night"
A5 Aminor Amajor
"we'd break under the weight of any pressure that was ever applied"
