They handle them with kid gloves, and hope for the best. If the performer can keep it off the stage, they may be able to manage, but people who act out, even offstage, get a reputation that eventually catches up to them.

Here are some famous performers who had severe psychiatric problems: Brian Wilson, Syd Barrett, Kurt Cobain, Sinead O'Connor, Ray Davies and Nick Drake. You know how it worked out for all of them....