Boy - a contagious confection that has spread across the internet like wildfire. The Hamburg-based duo sing smart, sharply-observed songs with hooks you can't get out of your head and lyrics that come from the heart.
Having conquered their native Germany and Switzerland, Valeska Steiner and Sonja Glass are shipping their sharp brand of pop back to Britain.
The BOoy phenomenon began with Little Numbers, the irresistible debut single which has sparked countless YouTube tributes.
With its compelling and breezy optimism, it is one of those out-of-nowhere pop hits that brings a smile to your face. The colourful video - shot on the streets of Barcelona in summer and starring passers-by and local kids - has already clocked up over 3.5 million YouTube hits since it was uploaded.
And the song swiftly spawned countless tributes from fans posting their own versions. The debut album, Mutual Friends, is an autobiographical affair.
Its 12 songs tell the story of two girls from different lands who met, became friends, began making music together, and struck a chord with everyone who heard them.
Beneath the sweet surface, Boy's songs reveal inventive twists, adding subtle experimental touches to a conventional pop palette of piano, guitar, drums and bass.
A rotating roster of friends jumped in to play on the album, among them Phoenix’s drummer Thomas Hedlund.