Frank Zappa - Muffin Man Bass

Tuning: Standard

G|-----------------------------|
D|----------------------2------|
A|-----------2---2-3-4---4-4---|
E|-2---2-3-4-------------------|

This is the main riff of the whole song, as the song is primarily a guitar solo.
I have put some variations to play occasionally through the song below to make it more interesting.
I found them in live performances of the song and some hidden in the "Bongo Fury" version.

#1

G|------------------------------------------|
D|---------------------2-------/6-4\2-1-----|
A|-----------2---2-3-4-----4------------2---|
E|-2---2-3-4--------------------------------|

#2

G|------------------------------------------|
D|----------------------2-------------------|
A|------------2---2-3-4--4-4---4---6--7-----|
E|-2---2-3-4---------------------------0----|

#3

G|----------------------------4-6-----------------------------------------------------------|
D|----------------------2---------5-4--2-4-------------------------2------4h6-6p4-----------|
A|-----------2---2-3-4---4-4---------------4-2-----------2---2-3-4--4-4-----------2h4-4p2---|
E|-2---2-3-4-----------------------------------2---2-3-4------------------------------------|

You could make up more, these should give you a rough idea of where to improvise.