Conversation so far:
when was the return to the quartet?
In April 1997, the Flecktones became a quartet again, as they added saxophone player Jeff Coffin to the mix.
did they record an album?
In June 1998, the Flecktones released their sixth album, and fifth studio album, Left of Cool.
how did the record do?
CANNOTANSWER.
did they produce any other records?
In July 2000, the Flecktones released their eighth album, Outbound.
how did that album do?
The album earned the Flecktones the Grammy for Best Contemporary Jazz Album that year.
did they go on tour?
Live at the Quick, which was also released as a DVD, is the band's ninth album, and second live album.
Are there any other interesting aspects about this article?
For The Hidden Land, the Flecktones didn't want any guest musicians.

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