this song is from the 1974 album Up for the Down Stroke by Parliament.
guitar intro then the bass comes in at 0:11
S S S S S S S S S
G-------------------------------------------------------|
D-3-3-3--r--3-3-3--r--3-3-3--r--3-1---------3-1---------|
A-----------------------------------3-1---------3-1-----|
E---------------------------------------3-1---------3-1-|
[ Tab from: https://www.guitartabs.cc/tabs/p/parliament/testify_tab.html ]
G--------------------------------------------------------------------|
D--------------------------------------------------------------------|
A-------------------------------0-1-1-1-1-1-1-2-3-3-3-3-3-3--3-2-1-4-|
E-1-1-1-1-1-1-2-3-4-4-4-4-4-4-4--------------------------------------|
Repeat afew times then in the verse plat this....
G---------------------|
D-------------1h3-1h3-|
A---------------------|
E-1-1-1-1-1-1---------|
just play that with some funky fills but don't go over bord with them
listen to the song to gt the right timing etc.