This is what we found on Wikipedia regarding the Ganggajang:

Ganggajang, stylised as GANGgajang are an Australian pop rock band which formed in 1984.

The four founders are frontman Mark 'Cal' Callaghan (ex-Riptides) on guitar and lead vocals, Chris Bailey on bass guitar, Graham 'Buzz' Bidstrup on drums (both ex-The Angels) and Kayellen Bee vocals and percussion. They were soon joined by Geoffrey Stapleton (ex-the Aliens on keyboards, guitar and vocals, and Robbie James on lead guitar.

Their most popular song, "Sounds of Then (This Is Australia)", was issued in December 1985 and peaked in the top 40 on the Australian Kent Music Report Singles Chart. It gained further exposure in Australia ten years later when it was used on TV in a Coca-Cola ad and then for the 1996 Nine Network station ID promotion. It was added to the National Film and Sound Archive of Australia's curated collection, Sounds of Australia, in 2016; and was the opening song for the 2024 Australia Day concert performed at Sydney Opera House and beamed live on ABC TV, performed by GANGgajang and William Barton.

Their highest selling album was GANGgajang, which was released in November 1985. They have issued three other studio albums, GangAGAIN (1987), Lingo (1994) and Oceans and Deserts (2002).