Conversation so far:
When did the Guttermouth lineup change?
The following year found Guttermouth returning home to California and experiencing a lineup change. Clint Weinrich married in the spring of 1995
How did the Guttermouth lineup change in 1995?
To fill in for Clint Weinrich on a European tour Guttermouth recruited Steve Stever Rapp, a college friend of Nunn's who was playing in a band called The Grabbers.
What else changed in the Guttermouth lineup besides recruiting Steve Stever Rapp?
Rapp left Guttermouth in 1999, at which point Nunn moved from drums to bass and new drummer William Ty Smith was brought in.
What did Rapp do in the band Guttermouth?
In 1997 Guttermouth recorded Musical Monkey, an album which captured their chaotic energy and sharp sense of humor.
Did the lineup of Guttermouth change in any other way musically after Musical Monkey?
Mystical Monkey is considered by many as the best representation of Guttermouth's classic sound; songs like Lucky the Donkey, Do the Hustle, Lipstick and Perfect World became live set staples.

Question: Were they successful during this time?
Self-contained rewrite: Was Guttermouth successful during this time with Rapp as bassist?