Digital music sales are enjoying a boom, as more and more of us carry around devices that are able to store and play music.While it is a given that we are all consuming more music digitally rather than via more traditional methods such as vinyl or CD, what has surprised some is the rate at which that adoption has increased."So far this year, digital album sales in the US are up 15 per cent from the same period last year," notes Nielsen.Nielsen, which describes itself as "a global leader in measurement and information", has been monitoring digital music sales in the US and found that Americans have already purchased one billion digital tracks so far this year.That number - 15 per cent up on last year - is set to break 2011\u2019s record of 1.3 billion tracks sold.The reason? According to Nielsen it's because we've all got smartphones now."A look back at music sales over the past few years found that the explosion of devices on the market -such as smartphones and tablets - and their increasing role in consumers\u2019 everyday lives has played a major factor in the growth of digital music," says the organisation.\u201cAs we look ahead, it\u2019s clear that digital music purchases - and consumption through streaming sources -will continue to grow, and that consumers\u2019 appetites for digital music will change at the speed of technology,\u201d said David Bakula, senior vice-president of client development at Nielsen.\u00a0Are you listening to music more? Let us know in the comments below.