Elbow's Mercury Prize win this week was a victory not just for their album, The Seldom Seen Kid, but also for the notion that it is possible for a band to enjoy a long and fruitful career in today's music business.The Manchester five-piece have been releasing records for 18 years, and have managed to overcome the setback of being dropped by V2 in 2006.But do not think that success and longevity com