United Kingdom, March 30 -- Barry Manilow is in "agony" as he waits for his "voice to come back" following lung cancer surgery.

The 82-year-old crooner postponed all of his upcoming concerts so he could undergo an operation to remove a cancerous spot from one of his lungs late last year. He had originally planned to be back on stage in January but his comeback has been rescheduled until later in the year because his recovery has been taking longer than expected - and Barry has admitted he has "no patience" and the waiting is driving him "nuts".

He told The Sunday Times newspaper: "I am still not there yet ... I'm not totally healed. The doctors said that it would take a while, but I have no patience and waiting is agony.

"For my voice ...