The stage illuminates, the bass kicks in and your favourite musician appears on stage. It's an electrifying moment, and one you'll remember for years to come. But it's become a whole lot easier to relive these moments as more concerts are turned into blockbuster films or livestreamed - for a fee - to fans across the world. Looked at one way, everyone's a winner. Music lovers get more chances to see their favourite artists perform, and the acts get another potential source of financial support.