Conversation so far:
when was the return to the quartet for the Béla Fleck and the Flecktones?
In April 1997, Béla Fleck and the Flecktones became a quartet again, as they added saxophone player Jeff Coffin to the mix.
did Béla Fleck and the Flecktones record an album?
In June 1998, Béla Fleck and the Flecktones released their sixth album, and fifth studio album, Left of Cool.
how did the record Left of Cool by Béla Fleck and the Flecktones do?
Billboard Heatseekers 6
did Béla Fleck and the Flecktones produce any other records?
In July 2000, Béla Fleck and the Flecktones released their seventh album, Outbound, another studio album.
how did the album Outbound by Béla Fleck and the Flecktones do?
Billboard Top Contemporary Jazz Albums 3
did Béla Fleck and the Flecktones go on tour?
In July Béla Fleck and the Flecktones toured Europe and sat in on the second set of a Phish show in Lyon, France.
Are there any other interesting aspects about Béla Fleck and the Flecktones article?
For The Hidden Land, Béla Fleck and the Flecktones didn't want any guest musicians.

Question: why did they not want guest musicians?
Self-contained rewrite: why did Béla Fleck and the Flecktones not want guest musicians?