Kellie Pickler will perform her emotion-packed single, "I Wonder," on ABC's Good Morning America on Monday, July 23. Kellie wrote "I Wonder," from her debut album, Small Town Girl, about her absent mother, who left Kellie as a child. The single is currently in the Top 15 and climbing the country chart. "It's a very personal song and I cry almost every time I sing it,' says Kellie, "So I better make sure I'm wearing the waterproof mascara that day." Later that night, also on ABC-TV, Kellie will be among the artists featured on the star-studded special, CMA Music Festival: Country's Night to Rock.