It may not be having the best season in the ratings, but Simon Cowell's "X Factor" is definitely a factor in song sales.
The sweetheart duo Alex & Sierra's cover of the Sara Bareilles song "Gravity" has the top spot on iTunes' song chart following their performance on the Fox show this week. Their version of A Great Big World's "Say Something" was also still in the top 10 as of Friday afternoon after hitting No. 1 last week.
Alex & Sierra, who are dating, are not the only "X Factor" finalists performing well on the charts.
Jeff Gutt's performance of the frequently covered Leonard Cohen-penned "Hallelujah" is in the top 10 overall, while on the rock chart, he has six of the top 10 singles. Carlito Olivero has the No. 6 song on iTunes' Latin chart.
TV programming is a powerful driver of digital singles, with shows such as NBC's "The Voice" and Fox's "Glee" often producing tracks that climb the iTunes rankings. In fact, A Great Big World and Christina Aguilera's recording of "Say Something" is still a top seller on iTunes, helped by their performance on "The Voice," on which Aguilera is a judge.