Sheryl Crowe back on stage

Sheryl Crow

Knocked down by cancer, Sheryl Crow is back to rock'n'rolling.

The singer made her first public performance after undergoing breast cancer surgery in February and subsequent radiation treatment.

Crow sang three songs at a sales presentation, appearing to move gingerly onstage.

Showing rustiness, she stopped the song Soak Up the Sun and started again after flubbing the lyrics.

"I think the radiation went to my brain," she said.