Crow back on tour after cancer op

Sheryl Crow says she is looking forward to the tour

US singer Sheryl Crow has rescheduled dates for her North American tour which she was forced to scrap to have surgery for breast cancer.

Crow, 44, is currently having radiotherapy treatment, which is expected to continue for several weeks.

Her tour was due to begin this month but have been pushed back to June, with extra dates added for July.

"I'm doing really well. Strangely, I feel clear and optimistic," she wrote on her website.

Celebration every night

Crow added that she expected to feel tired for a month after the radiation treatment but would be "taking it easy" before the summer tour.

"It is my favourite time to tour and I feel certain, for me, it will be a celebration every night of how lucky I feel with this life I've been given," she said.

She also thanked well-wishers who had sent cards, letters and flowers during her treatment.

Crow has been told by doctors that her prognosis is "excellent" as the cancer was caught early.

The tour will take in cities including Boston, Toronto, Atlanta and Memphis.