Norway's downtempo trailblazers Royksopp return after a four-year hiatus with JUNIOR, which should whet the appetites of casual pop music listeners and ardent dance aficianados both. For their third studio effort, the duo has enlisted the aid of the Swedish pop stars Robyn and Lykke Li to flesh out the sound. And JUNIOR demonstrates not only their precision and skill as producers, but also a maturity in the songwriting, which betrays a warmth lacking in most electronic music. minimize