Jonnie and Brookie are using their voices for good — and singing a song for young Kate McRae.

The singing sisters and former N.B.T. reigning champions will be hosting a concert with Mission Six to benefit the young girl, who is only 6-years-old and has been fighting brain cancer since last year.

Kate will be tuning in via Skype from Phoenix Children’s Hospital to watch the concert being held for her at Cornerstone Church.

WHERE: Cornerstone Church 1595 South Alma School Road Chandler, Arizona 85286.

WHEN: Saturday, February 27 @ 6-8:30PM

HOW MUCH: $2.00 at the door and all monies will benefit Kate and her family.

Check out the promo poster inside…