Originally a string quartet formed by four girls at the Reykjavík College of Music in the 1990s, Amiina went on to cut their teeth as Sigur Rós' string section for the next decade. Now a sextet after a recent masculine infusion, Amiina presents their second full length album, Puzzle. Amiina's debut album, Kurr (2007), was performed on a disparate jumble of instruments -- musical saws, kalimbas, music boxes and seemingly anything that could be plucked, bowed or beaten on -- resulting in a work that ebbed and flowed "in a strange, powerful place between and innocence," according to The Guardian (UK). While the above is equally true of Puzzle, this time around the group's sonic palette is broadened by the contributions of drummer Magnús Trygvason Eliassen and electronic artist Kippi Kaninus, permanent members of the group since 2009. Accordingly, the songs on Puzzle are more rhythmically rugged than Amiina's previous work and feature heavier use of electronics. Amiina's long-standing fondness for zero-g melodies and open-minded instrumentation, however, continues.