In 2000, while also working with Silverchair, Johns and Mac released an internet-only EP, I Can't Believe It's Not Rock. In mid-2003, during Silverchair's hiatus, the pair re-united and formed The Dissociatives, releasing a self-titled album in April 2004. The duo provided the theme music for the popular ABC-TV music quiz show Spicks and Specks - as a reworking of the Bee Gees' 1966 hit of the same name. Johns also collaborated with then-wife Natalie Imbruglia on her Counting Down the Days album, released in April 2005.  Joannou worked with blues-rock group The Mess Hall; he co-produced - with Matt Lovell - their six-track extended play, Feeling Sideways, which was released in May 2003. The album was nominated for the ARIA Award for 'Best Independent Release' in 2003. Joannou and Lovell co-produced The Mess Hall's studio album, Notes from a Ceiling which was issued in June 2005. Joannou and Lovell received a nomination at the ARIA Music Awards of 2005 for 'Producer of the Year'. In 2003, Gillies formed Tambalane with Wes Carr, initially as a song-writing project, they released a self-titled album in 2005 and toured Australia.  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.'"

Answer this question "What was one of their side projects" by extracting the answer from the text above.
Johns and Mac released an internet-only EP, I Can't Believe It's Not Rock.