It's a bit early for the big music companies to start panicking, but it looks like the heyday of double-digit growth in digital music sales may now be behind us. That's according to market research firm Nielsen
, at least, which found that sales in the US fell flat in 2010 after a 13 percent increase from 2008 to 2009, and a whopping 28 percent jump from 2007 to 2008. Nielsen is quick to point out, however, that it thinks this is a "plateau," and that it "doesn't mean that this digital consumption is going to drop significantly." It also still seems to be a different story outside of the US, with Nielsen reporting that digital music sales were up 7 percent in Britain, 13 percent in Germany and 19 percent in France.