Conversation so far:
What is mindcrime?
In 1988, Queensryche released Operation: Mindcrime, a narrative concept album that proved a massive critical and commercial success.
Was this a successful album?
The album gained critical acclaim and achieved gold status.
Can you tell me a little about the Empire and mainstream success?
The release of Empire (1990) brought Queensryche to the height of their commercial popularity.
It peaked at No.
7 and sold more than three million copies in the United States.
How long did it stay on the charts?
CANNOTANSWER.
Are there any other interesting aspects about this article?
The subsequent "Building Empires" tour was the first full-fledged tour to feature Queensryche as a headlining act.

Question: Was there any downside to the tour?
Self-contained rewrite: Was there any downside to Queensryche's "Building Empires" tour?