Hubbub is a collective of European (French or Swiss, I believe) improvisers who specialize (with this platter, anyway) in the more spacey/ambient mode of free improvisation. They lean more toward the organic approach of AMM and Richard Teitelbaum rather than the loopy, fragmented Company/Derek Bailey Brit thing or the balls-to-the-wall attack of Germans like Peter Brotzmann. The two pieces evolve slowly, placing the emphasis on texture and measured group interplay rather than catharsis or any sort of rhythmic impetus. Simply put, this is music for late nights, darkened rooms and perhaps some rapt reading, but demands more involvement than mere "background music." No one player dominates, everyone plays judiciously. UB/ABU is unlikely likely win many converts to Euro-improv, but those who admire or crave a more "impressionist" or ambient approach to free-improvisation will likely enjoy this.