Silverchair's single "Tomorrow" (Murmur/Sony) is the kind of success story that deserves to be made into a movie. With no TV, press promotion, or advertising, the unknown act has achieved platinum sales (70,000 copies) and is still No. 1 after six weeks on the mainstream chart. "Tomorrow" is the debut release by this trio of 15-year-olds whose passion for grunge, Led Zeppelin, and surfing brought them together in 1992 in Newcastle, an industrial town hours from Sydney. Daniel Johns (guitar/vocals), Ben Gillies (drums), and Chris Joannou (bass) are still at school, can only tour during holidays and weekends, and are managed by their parents. A few months ago, Silverchair drew only seven people to one of its gigs in Newcastle. Now the band is selling out 1,500- capacity clubs and turning 500 people away each night. Still unaffected by success, the band turned down the opening slot on a prestigious Midnight Oil/Crowded House/Hunters & Collectors tour to appear at The Big Day Our's shows, because they feel more comfortable playing alongside like-minded indie acts. Silverchair recently asked to be paid for a surf gig with three new surfboards. The band's success is due to the extraordinary influence of the Triple J radio network. The group's prize for winning a demo competition on the TV music show "Nomad" was a day of recording time at the network's studio. An engineer passed the tape to Sony manager of Australian A&R and international marketing John Watson and Murmur managing director John O'Donnell. But during the few weeks it took the pair to negotiate the deal, Triple J took the unprecedented step of airing the demo and putting it in high rotation following enthusiastic listener response. Consequently, the single was a chart hit even before its official release. "The band's audience reflects Triple J's 18-25 [demo] with left-of-center leanings," Watson says. "Audiences want fresh, credible acts, but it's taken Silverchair to slam home to the industry how radically things have changed. Theirs is the new face of Australian rock."