Amid Unrest and Tsunami’s latest bids for world indie-pop domination, those bands’ Mark Robinson and Jenny Toomey have taken time to collaborate on another Grenadine release, this one a clear-vinyl single strikingly packaged in a translucent plastic sleeve. Both the vocal “Don’t Forget the Halo” and the instrumental “Seven Hundred Seventy Seven” start slow, and the former (mostly) retains the smoky, languorous ambiance that makes Grenadine the Perry Como of post-punk rhythm-guitar bands. The latter, however, eventually kicks into gear and finally builds to an almost-Feelies-style rave-up. For those who never liked Perry Como all that much, it’s a kick. The single’s available from Simple Machines, P.O. Box 10290, Arlington, VA 22210.