iTunes accounted for 66.2 percent of the paid digital music download market in the third quarter, up from 63.2 in the year-ago quarter, according to the latest data from NPD. Citing the data, the Wall Street Journal reports that Amazon’s share of the market rose to 13.3 percent over the same period, up from 11 percent the year earlier; however, record label executives note that the disparity between the two may be even larger, with with Amazon…