Gartner Research predicts that with the decline of the physical format (like the compact disc) that subscription services and music downloads will flourish.

In a press release issued yesterday the Connecticut based information technology research company estimated that online music sales would reach $6.8 Billion worldwide in 2012 and $7.7 Billion Worldwide by 2015.

The company also predicts a decline in compact disc sales from $15 Billion last year to $10 Billion in 2015.