The 41-year-old Scottish musician feels good artists are losing out on radio air time because the music manager's label, reported Femalefirst.
"Parts of music have become a complete corporate exercise. It's always happened but it's just happening now on a much larger scale.
"The amount of artists putting music out now is unrecognizable. Be it Cowell's label or whatever, they're basically taking up a lot of air space when the new Bowie or the new Lou Reed can't get on the radio because X Factor has clogged up the airwaves. And it's not longevity, it's about money," Tunstall said.
"There's tons of female performers where you can tell they're getting their body out because it's going to sell their record.
"You can tell pretty easily which women in music are expressing themselves and celebrating their incredible hot bodies like Rihanna and Miley Cyrus and are making their own decisions and are in control of it.