Carrie lends vocals to cancer charity single

Carrie Underwood is one of 15 female singers that will make appearances on the charity single "Just Stand Up," which will benefit cancer research. The single will be released to iTunes on Sept. 2 and all 15 singers will perform it live on the "Stand Up to Cancer" television special, which will air on the three major broadcast networks: ABC, CBS and NBC on Fri., Sept. 5 at 8 p.m.

In addition to Carrie, some of the singers lending their talents on the single include Rihanna, Sheryl Crow and Mary J. Blige. The special and single are being sponsored by Stand Up 2 Cancer, the combined effort of many charitable organizations like the Noreen Fraser Foundation and the American Association for Cancer Research.