Taboo of the Black Eyed Peas has opened up about his recent battle with testicular cancer. The 41-year-old rapper says he checked into an emergency room in 2014 after having pain throughout his body after a show and found out that he had stage 2 testicular cancer. He underwent surgery and a 12-week course of chemotherapy before being declared in remission last year. Taboo's struggle with cancer has inspired a new song, called "The Fight." He says all proceeds from the single will be donated to the American Cancer Society. Taboo was named an ACS ambassador in May.