The following ranking comes from music software (DAW) specialist Digital Music Doctor.  Throughout the year, the company has been scanning roughly one-hundred search terms related to 15 music software packages.  And this is what they interpolated on broader demand.

This isn’t based on actual sales data, though search traffic arguably offers a rough approximation of demand.  “This index is based on a quarterly moving average of annual internet search activity on Google, Yahoo, Microsoft and AOL,” the company explains.  “Collectively these four search engines represent approximately 95 percent of searches on the internet.” –Digital Music News