Rock Band's game controller

Music-oriented video games like Guitar Hero and Rock Band are helping boost sales of digital music.

Released by MTV Networks and Harmonix two months ago, Rock Band players have downloaded over 2.5 million songs, according to Reuters.

Activision's Guitar Hero III: Legends of Rock sold over 5 million songs since adding downloadable content in November.

Gamers are reportedly more likely to pay for digital songs because they can "play" the song over and over again.

Meanwhile, mobile carrier Sprint took four months to sell just a million songs on its over-the-air full-song download service.