Live music overtakes recorded music in UK

This Guardian article points out an estimate that live music was worth more than recorded music in 2008. Also some links to a discussion about the "long tail" phenomenon. Two economists have estimated that of 13 million songs available for purchase on the Internet, only 3 million actually sold (see article). Emusic have disputed this here. Strikes me as a tricky thing to be able to measure, and I wonder whether emusic were considered in the original study as they have quite a different focus than more mainstream sellers like iTunes.