Half of all music sold in the US will be digital in 2011 and sales of digitally downloaded music will surpass physical CD sales in 2012, according to a new report by Forrester Research. Digital music sales will grow at a compound annual growth rate of 23 percent over the next five years, reaching $4.8 billion in revenue by 2012, but will fail to make up for the continuing steady decline in CD sales. In 2012, CD sales will be reduced to just $3.8 billion. (PR)