Boris' willingness to collaborate and play with expectation make them one of the most exciting and prolific bands around. Last year alone, the Japanese trio created Altar, an album of deep-drone bliss with Sunn O))), and the furious riffage of Pink. Rainbow continues the spirit of joining forces with their peers; with guitarist Kurihara in tow, the results do not disappoint. Neither as frenetic as Pink nor as ambient as Altar, Rainbow is, as the title suggests, a sun-kissed trip that has its feet planted in both the kaleidoscopic past and the bone-crushing present. Heavy and beautiful.