The 2004 Boxing Day tsunami resulted in the WaveAid fund-raising concert held in January 2005: Silverchair performed to help raise funds for aid organisations working in disaster affected areas. As a result of WaveAid the band decided to resume working together. Gillies explained the band's reunion as due to a special "chemistry" between band members, telling "The Sydney Morning Herald", "It only took us 15 years, but recently we've realised, 'We've really got something special and we should just go for it.'"