Four artists, two tracks, and two pairings of some of the most insidious and powerful dubstep and drum'n'bass gathered on one record.

The meeting-up of two high profile but very distinct producers, "Existence" is, by any standard, a beats of a track. Combining the clinically sharp and melodic drum'n'bass of DJ Hidden with the organic basses and monstrously detailed sound assemblage of Broken Note was a tour-de-force for both parties. Here is a tune that went through countless versions, the artists ping-ponging with beats, drops and low frequencies. The result paid off, as "Existence" is almost a genre in itself, from its hypnotic intros to the staccato oscillations of its bassline. Played out by both DJ Hidden and Broken Note at recent concerts, the fruit of this long alchemical process has proven to be an exhilarating, deadly one.

On the flip side, Balkansky & Niveau Zero's collaboration is another carefully planned effort of two producers with different techniques. Started as an experiment right before an Ad Noiseam night in Paris during which both acts were playing, "Obey" is, just like "Existence", the result of a Niveau Zero's epic dubstep colliding with Balkansky's gritty one (and Cooh's infectious drum'n'bass). Both carried by a rich melody and broken by sudden drops and edits, this track is heaven for head-bangers and thrashers with its abysmal bass and constant changes.

Much has been written about the combination of hard dubstep and dark drum'n'bass, and many tracks have been written to try to reconciliate both genres. With this record, though, it is the collaboration of confirmed, veteran artists which gave birth to the most cohesive and efficient hybrid of these styles to date.