.: According to USATODAY.com, "The average amount of time annually that Americans spend listening to recorded music has declined, with the drop expected to continue." The graph shows that Americans spent 290 hrs/annually in 1999 vs. 228 hrs in 2002 and a projected 195 hrs in 2006. That may have something to do with declining CD sales vs. file-sharing, no?
They cite this source -- Statistical Abstract of the United States, 2003.