Emerging from Stockholm's inventive jazz scene in the late 1990s, Koop drew immediate notoriety for their unique and passionate musical fusion. 'Waltz For Koop,' the duo's second album, established Koop as true pioneers, unafraid to blend diverse styles into their own retro groove. The collection received reams of critical praise, with Muzik hailing it as "near-perfect." "Stirring atmospheres are Koop's true forte... beautifully arranged," noted Q, while The Observer declared the album "highly infectious - a delight." "('Waltz For Koop') is something special and unprecedented," raved The Independent, "a jazz-meets-electronic-dance-music album that actually sounds like jazz."

In the four years since the initial release of 'Waltz For Koop,' it has found its way into the hearts of more than 160,000 record buyers around the globe. A number of world tours followed (including appearances at such renowned festivals as Glastonbury, Montreux Jazz Festival, Pukkelpop, Umbria Jazz, and Roskilde), as well as hundreds of remixes for artists ranging from like-minded British duo Zero 7 to legendary Afro-Peruvian songstress Susana Baca to the one-and-only Yoko Ono.