Country fans already know Martina McBride has a million-dollar voice. She'll put her brainpower to the test as a celebrity contestant on Who Wants to Be a Millionaire, taping this week in New York City. McBride's winnings, guaranteed to be at least $32,000, will be donated to a charity of her choice. An air date has not been announced. McBride also will lend her talents to a good cause on Sunday (Oct. 21) as part of CMT's Country Freedom Concert. The Nashville show will feature George Strait, Alan Jackson, Brooks & Dunn, Tim McGraw, Vince Gill and many others. Proceeds go to The Salvation Army's Disaster Relief Fund. On Oct. 26, McBride joins Elton John, Mariah Carey, Lenny Kravitz, Sugar Ray and Jay-Z on the 2001 Radio Music Awards at the Aladdin in Las Vegas. The awards program will be carried live on ABC at 7 p.m. ET.