Conversation so far:
What was significant for the band in 1990?
Mr.
Bungle was signed to Warner Bros.
Records in 1990.
When was their debut album released?
August 13, 1991.
Are there any other interesting aspects about this article?
Their debut album, Mr.
Bungle, was produced by jazz experimentalist John Zorn and was released on August 13, 1991.

Question: Who worked on the debut album cover?
Self-contained rewrite: Who worked on the debut album cover for Mr Bungle's debut album?