Forty percent of tablet owners report they use it to listen to music, while 56 percent of smart phone users say they use it for music listening.
The 10 most popular posts at Audiolicious.tv for 2012, according to page views.
Advertising revenues, which already make up the bulk of US mobile music revenues, will gain an even greater share in the coming years, eMarketer forecasts, and by 2016 will account for more than 86% of all such revenues.
While online and mobile music revenues are expected to show strong growth rates in both the US and globally this year, physical music sales are projected to be down by 9% in the US, and 12% globally.
Trade publication Billboard recently updated its weekly Hot 100 song chart to include data from Spotify, Slacker, Rhapsody, Cricket/Muve, Rdio and MOG.