Australian singer Helen Reddy decided to get back on the road after singing a duet with her theatre star nephew Tony Sheldon at a family party.

The musician, who was the first ever Aussie to win a Grammy Award, retired from performing in 2002 and retrained as a hypnotherapist.

After a handful of performances in 2012, she is touring again for the first time in over a decade, and the 72 year old reveals singing at her actress sister Toni Lamond's birthday party helped her rediscover her voice.

She tells the Sydney Daily Telegraph, "It was her (Lamond's) birthday, and she had a big party and we (Reddy and Sheldon) sang together. It was the first time I'd heard my voice on a monitor in 10 years and it was like, 'Oh, I've still got it, I should really get back to doing that' and so here we are."

The I Am Woman hitmaker kicks off her tour in Melbourne, Australia on Friday (05Apr14).