We've got one pair of tickets for a lucky soul this week, an all-inclusive night of ambient and post-rock at Cafe du Nord: Lymbyc Systym, Helios (Portland) and Cloud Archive (Saturday, 9:30pm). Lymbyc Systym (Tempe) is a sibling duo who have kept the momentum going since early last year: doing a split EP and tour with This Will Destroy You, and a full-length in November which they're promoting now by touring with Helios. Shutter Release (Mush Records) is a smooth continuum of highly complex electronic-meets-post-rock, sounding like both a challenge to execute and a treat for the live audience. To [...]