The sonic vibrancy of tropical rainforests is highlighted on the one long (45 minutes) track of Untitled #90. But, of course, in the hands of Francisco López, the kinetic sounds are manipulated and shaped in most imaginative ways. Opening with the buzzing hum of life (insects? birds? animals?), the ambience of life within the moist, humid rainforest, envelopes the listener. Not just simple field recordings, the sounds are looped, subtly stretched and tweaked, in such a way as to really bring the…