The government recently announced an initiative to encourage children to sing more and make use of music as a means of self-expression. They should consider enlisting the help of freeform singing collective I'm From Barcelona. Far from expat Catalans, IFB are a loose ensemble of amateur or non-musicians from Jonkoping, Sweden - effectively, the friends and followers of leader Emanuel Lundgren. The 29-strong troupe recorded an EP "as a lark" two years ago and, as YouTube-fuelled interest snowballed, quickly acquired a cult following and a major-label deal.

I'm From Barcelona sing big, shiny songs about seeing the world through a child's eyes. Members pogo, race on stage or grab the nearest kazoo, accordion, tuba, xylophone or ukelele: the effect is akin to anarchy in the school music-room, or a birthday party full of toddlers on a sugar rush.

Lundgren, looking like a hippy porn star, coordinates the chaos rather like the conductor of the Muppets' in-house band. Songs are rudimentary but hugely infectious: during the shrill choral assault of Treehouse or the kinetic buzz of Oversleeping, the group beam with glee at the sheer visceral thrill of singing.

It's mildly trippy but spectacularly wholesome, as if the Flaming Lips had been injected with the spirit of Dick and Dom in da Bungalow. Such pathological enthusiasm should grate, but somehow IFB's ingenuous mass celebration manages to appear both profound and life-affirming. They close with a happy-hardcore take on their preposterously catchy theme song, We're From Barcelona, and are submerged in a stage invasion. Novelty band? Sure, but if you can't crack a smile at I'm From Barcelona, you are the biggest curmudgeon in the world.