Following its season premier in April, the music-themed TV show “Glee” saw track downloads from its four compilations jump from 50-350K in the first week. The show’s latest “Showstoppers” album topped the Billboard charts this week as digital sales of all “Glee”-related songs exceeded 500K.

Performers like Bruce Springsteen who performed at last year’s Super Bowl see significant boosts to album, catalog, and digital sales.

The Nielsen Company revealed the impact that a performance on the Sunday Results programme of the UK series X Factor had on digital download sales (online and mobile), online buzz and radio airplay for the special guest stars promoting a track.

2009 music purchases in the U.S. were up 2.1% over 2008 figures, marking the second year in a row that sales exceeded 1.5B units sold according to Nielsen SoundScan.