Judges from the music industry named the top six bands and two solo/duos, selected from DVDs submitted since the regional finals.
Matt Warman, bass player from Kiwi band Midnight Youth, said the Smokefreerockquest finalists demonstrated that music in New Zealand was in a very good place.
"What really excited me was seeing that in spite of all the iPads and iPhones kids are still into the fundamentals of what music is about - guitars, basses, drums and making really good rock 'n' roll."
The two bands will be up against The Moots from Auckland, SundayBest and All of a Kind from the Waikato and AashaWillandCullen from Christchurch.
The solo/duo finalists are Harry Parsons from Cambridge High School and Khona Va'aga-Gray from Manukau.
The national final of Smokefreerockquest is at the Raye Freedman Arts Centre from at 7pm on September 28.
National winners receive a recording and music video package from NZ on Air, inclusion on the NZ On Air Kiwi Hit Disc, radio promotional support and video play on youth music channel FOUR. Thousands of dollars worth of musical equipment will also be won.