I was asked recently to look at some data on employment in the copyright industry.  This addresses one set of data points, the BLS estimates of US employment in the Sound Recording Industries.  
Occupational Employment Statistics
NAICS 2-Digit Industry Specific Estimates, May 2010
51  Information  2,708,760
NAICS 3-Digit Industry Specific Estimates, May 2010
511  Publishing Industries, except Internet, 758,090, 28.0%
512  Motion Picture and Sound Recording Industries, 371,450, 13.7%
515  Broadcasting (except internet), 292,010, 10.8%
517  Telecommunications, 909,780, 33.6%
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