Jeff Fatt was on the roof of his house fixing tiles when a phone call came through from his friend Anthony Field asking for help. Field, a trainee early childhood teacher at Sydney's Macquarie University, was recording children's songs for a project he was doing with two other students.
'I told Jeff we needed that piano boogie woogie thing he did so well,' Field recalls. 'He asked how long would it take? I said a couple of hours.'
That was 20 years ago. Fatt, who had previously worked with Field in the 80s pop band The Cockroaches, took up the offer and joined Field and fellow students Murray Cook and Greg Page. The collection of songs they produced was released as an album in 1991 - and The Wiggles were born.
Fast-forward to 2011 and The Wiggles are one of the most popular children's entertainment groups in the world with an army of fans stretching from Australia, across Asia, Europe and to the US and South America.
They have sold more than 30 million DVDs and CDs with several records attaining gold and platinum status. They've received many awards, recorded 700 songs, sold six million books worldwide, worked with Kylie Minogue, and have even been transformed into cartoons.
Their shows have aired in 147 countries and inspired a Wiggles World section at a Gold Coast amusement park. In 2008, they were made Unicef Goodwill Ambassadors focusing on numeracy, literacy and sanitation.
'It's unbelievable it's been 20 years and I still shake my head at that,' Field says on the phone from Sydney. 'We've worked so hard and it's gone so fast. I couldn't tell you how many times we've been to Hong Kong or how many times we have been to the US because we have done so many things. Maybe one day I will have the time to look back and remember it all, but at the moment we are just so busy.