In-stat is reporting that by 2012, digital music sales will represent 40% of all music sales worldwide. Digital sales have gone from 6% in 2006 to 10% in 2007. Factors influencing the growth are broadband expansion, increases demand for single-track download and expanding online music catalogues. According to In-Stat, the obstacles for Digital downloads are Piracy, interoperability between services and weak consumer demand for subscription-based services. In-stat found 48% increase in online music sales revenue in 2007 compared to 2006. If you consider Apple’s iTunes Music store, the music sales have doubled every year for past three years. In less than three years iTunes has gone from 5% market share to more than 19% market share in total music sales in US. Making it the number one music reseller in US. The online Music sales will definitely rise with increase in DRM free music. You can get more information about In-Stat research on their website.