You can't force something like that. But we have encouraged our audience, because we avoid the confrontation of regular rock concerts: us up here, you down there. Instead, we're looking for interaction.
Every piece has its own identity which we develop by the rule 'We know no limits.' We follow the inspiration of the moment and don't worry if what we're playing is alternative, progressive or fusion rock.
Each of our 900 shows so far was different - maybe that's what makes the fans come back to our gigs time and again. And that they're always part of the show. Phish concerts are a communal experience.