TesseracT + The Contortionist + E.R.R.A.

Known for helping pioneer "djent" (the prog-metal spinoff so-titled onomotapeically for its sludgy palm-muted guitar), U.K. act TesseracT channels the mechanistic, off-kilter riffery of Meshuggah into shamelessly grandiose postprog nerdery on the recent Polaris, a virtuostic effort which effectively synthesizes the band's previous eclectic tendencies.