Heard about Twitter lists? It’s a new feature on the micro-blogging service that lets users create lists of other users, with unique URLS offering a stream of those users’ tweets. Twitter has turned the feature on for about half of its users this week, expanding on its previous low-key tests. What does this mean for the music biz? There should be some interesting lists kicking about with a music theme – for example tracking artists from specific genres or countries. Meanwhile, you can imagine labels using it – offering a list with all of their artists – or artists themselves compiling lists of their favourite Twitter users.