Introduction

Abstract

Suppose for a moment that you’re the lead singer of a well-known rock and roll band … every night performing at overflowing sports arenas and being cheered by your enthusiastic fans. One night, you get this live connection to your public when they all start singing along with you. The energy flowing from an audience that’s going wild pushes the band on to greater heights, each single band member is playing as never before and as a band you all reach some kind of harmonic perfection. Both band and audience are aware that they have participated in something very special everybody leaves, still buzzing with excitement. The next day, at work, in school, everybody who attended the performance is talking about the great experience they had; their friends are all seriously miffed that they weren’t there, but will be buying the CD and making sure they won’t miss the next concert.