Human Nature are an Australian pop vocal group which formed in 1989. They are a quartet featuring Toby Allen, Phil Burton and brothers, Andrew and Mike Tierney. Originally they were established as a doo-wop group called the 4 Trax, when the members were schoolmates. After signing with Sony Music as Human Nature, they released their debut album, Telling Everybody, in 1996. Four of their albums have reached number one on the ARIA Albums Charts, Counting Down (May 1999), Reach Out:... [more on Wikipedia]