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Greg Page, a founding member of the popular children's music group The Wiggles, has collapsed at a bushfire relief show in Sydney.

Page - who used to perform as the yellow Wiggle - sang on stage for an hour and a half before suffering a cardiac arrest.

The band tweeted that Page was recovering in hospital.

The Wiggles were created in 1991 and have sold tens of millions of CDs and DVDs around the world.

Page was a founding member and the original lead singer.

He retired due to ill-health in 2006, returning briefly in 2012 before leaving again. Reports in 2006 said , an illness related to blood pressure.

Thursday was the singer's 48th birthday.

This performance was the first of two scheduled with the original Wiggles cast.

It was a sold-out, adults-only performance, with all proceeds going to the Australian Red Cross and the NSW Wildlife Information Rescue and Education Service (WIRES).

Page - along with fellow founding members Murray Cook and Jeff Fatt - left the band in 2012. A new line up consisting of original member Anthony Field and new singers Lachlan Gillespie, Simon Pryce and Emma Watkins debuted at the end of that year.

Several of the group's records have gone multi-platinum, and The Wiggles have won 14 Australian Recording Industry Association music awards for Best Children's Album.

In 2011, the band ranked second in terms of earnings on a list of Australia's top 50 entertainers, making more than A$28m (£14.8m).