Whiteny Houston performed on Good Morning America today (it was taped yesterday) as part of her comeback tour in support of her recently released I Look to You album. You can watch the video of the performance, which includes takes of "I Look to You," "I'm Every Woman" and others, by heading to Good Morning America's website. During the performance Houston was breathless and her voice cracked repeatedly, which she blamed on being worn out from a taping on Oprah's show earlier this week. YouTube video of her explanation for the voice is below. Maybe she's just completely out of treacly ballad singing shape.