Conversation so far:
What happened in the middle period?
The group's third studio release, 1993's Buhloone Mindstate.
was it successful?
The album was a critical success, but it was the biggest commercial failure for the group at the time of its release.
why was it a fauilure?
Many publications, such as Rolling Stone, have listed this album as one of the best hip hop albums of all time.
did they win any awards?
it was the biggest commercial failure for the group.
did they produce any other music?
In 1994, 500 copies of a promotional EP called Clear Lake Audiotorium were released on clear vinyl and CD.
did they tour?
CANNOTANSWER.
Are there any other interesting aspects about this article?
The album did provide a launching pad for future star rapper and actor Mos Def, who appeared on.

Question: what did he appear on?
Self-contained rewrite: what did Mos Def appear on the Buhloone Mindstate?