It would be too easy to assume that the interest surrounding Smoosh is due almost entirely to the novelty factor of their age. But with their well-received debut album She Like Electric behind them, the Seattle born sisters - both under the age of 16 - set out to dismiss the sceptics. With stage confidence on their side from a history of supporting big name bands such as Death Cab for Cutie and Jimmy Eat World, the band plough through a set of stomping piano driven, melancholic pop, proving that they do, in fact, have songs. More accurately, they've a wealth of memorable and well-formed pop songs.

Any optimism left behind by Smoosh is dispersed within minutes of The Grates arriving on stage, as aptly named singer Grates Patience pogos and thrashes around the stage in effort to sell the band to a now completely filled-out Koko. But all her forced energy is wasted as the band bash out half an hour of forgettable 'scuzz' rock a la the Yeah Yeah Yeahs but without any discernible songmanship. Leaving nothing vaguely memorable behind apart from mild contempt for their ProPlus-loaded frontwoman. No, she hasn't stopped jumping yet. Maybe if they ask nicely, Smoosh will lend them a few hooks.

The Go! Team launch themselves onto the stage as the crowd erupts in an unreserved fit of feverous waving arms. The one-person cheerleading team that is frontwoman Ninja is last to come on stage, getting the biggest response of all. Her act is now polished to its best, always full of confidence but never crossing into arrogance or obnoxiousness. The band burst straight into the album favourites, with the crowd not only singing along to every word, but to every horn, harmonica and even recorder. No one cares that the opening horns of 'Bottle Rocket' are coming from nowhere, unaccounted for on stage - it's such a glorious burst that you can't help but be swept up in The Go! Team's bustling carnival.

It's the first of three back-to-back sell-out shows at Koko, and with their prime fan-base at their feet the band take the opportunity to air a considerable amount of new material: most of it sticks firmly to the Thunder! Lightning! Strike! formula of floor stomping beats and dual drumming action, horns, and triumphant shout-a-long choruses. Initially the songs aren't as instinctively likeable as the album favourites, but the band carry them through with the same all-conquering enthusiasm, which is reflected in the crowd, itself reduced to a mass of waving arms and pumping fists. 'We Just Won't Be Defeated' could quite easily be the band's motto, the optimism, as always, comes only in super-sized portions.

The obligatory encore the band finish on their national anthem, 'Ladyflash'. Exhausting themselves of all remaining energy, they draw out the song for well over ten minutes. The stage is filled with a team of air-punching and break-dancing Ninja sidekicks, rendering the already slightly pointless visuals completely unnecessary. The band exit as victorious as the horns they rode in on. Bodies are left tired, but there's not a frown in sight.