Motor City Masters, Fri Sept 28, 9 pm, Showbox at the Market: Detroit techno's eternal importance to electronic music gets reiterated with performances by Carl Craig (aka 69, the most talented of the second wave of Motor City producer/DJs along with Jeff Mills and Rob Hood), Octave One (old-school, soulful trackmakers who remain relevant today), and former Seattleite/ex-Detroiter Jerry Abstract, whose DJ sets tap into the hardest and best specimens from back in the day and right now.

Raster-Noton Showcase, Fri Sept 28, 10:30 pm, Melrose Market Studios: Raster-Noton is the damn-near-infallible German experimental-electronic label. Its artists' highbrow aural emanations and severe, geometric visual accompaniments have yielded legendary results at past Decibel and MUTEK fests. Byetone and Kangding Ray bring a shocking rhythmic vitality to R-N's patented op-art minimalism and bleepy pointillism. These eggheads' tracks will stun you with their funkiness and danceability. Emptyset makes minimal techno that's coated in tar and throbbing with primeval vengefulness. Charles Bronson would love it.

Optical 3: Touch 30, Fri Sept 28, 7 pm, Broadway Performance Hall: On this bill of elite atmosphere conjurers, the most intriguing figure is Eleh. This enigma creates some of the most tabula-rasa'd drone that ever droned you into the Zen zone. With Jon Wozencroft, Biosphere, the Sight Below, lissom, and Leo Mayberry.

XLR8R Presents, Fri Sept 28, 9 pm, Baltic Room: The music on Actress's three scintillating albums slithers among pre- and post-dubstep genres with slick friction. Strange textures, eerily beautiful atmospheres, and coiled rhythms send you down fascinating and surprising alleyways. With Gulls, Teengirl Fantasy, and Ghosts on Tape.