OUSIA  -  The band was formerly knownas Blue Shift, and the latest effort from ex-Shapeshifter guitarist Paul Horn makes slowly climaxing, electronic mood music (they're regulars atthe electro-friendly Future Perfect nights), yet it's guitar-based and pointedly theatrical.  This is the prerelease party for the band'sAug. 12 release, Why Is That A Four?, and if nothing else go for the cozy environs of the Twilight Lounge, the semi-new music room in the back of Jitters that's an ideal setting for this sort of extended wig-out.
$3. 8 p.m. Twilight Lounge, 1026 Nicollet Mall, Mpls.;333-8511. (Groebner)