X-Factor runners-up and 'popera' outfit - faves of Louis Walsh, they regrouped in 2014 for 10th anniversary shows.
The band features founder members, tenor Jonathan Ansell and baritone Mike Christie, plus Jai McDowall, and Duncan Sandilands.
They released their debut album, "G4" in 2005, followed by: "G4 & Friends" in the same year, "Act Three" (2006), "G4 Christmas" (2015), plus 2017's: "G4 Love Songs".