eMarketer has published its predictions for US mobile content revenues between now and 2014. The topline figure: they’ll rise from $1.5 billion in 2010 to $3.5 billion in 2014. But the company splits this out between mobile gaming, mobile music and mobile video, with music very much the poor relation. It predicts US mobile music revenues of $143.2 million this year, rising to $676.5 million in 2014. That’s much smaller than mobile games ($849 million to $1.5 billion in the same period) and mobile video ($548 million to $1.3 billion). However, mobile music will show the fastest growth. eMarketer thinks there’ll be 21.7 million mobile music listeners in the US this year, rising to 52.2 million by 2014 – at which point they’ll be 19.8% of the mobile population.