Although it has been suggested by academics and authorities in the field that underground hip-hop has no sonic unifers—I mean try and compare Army of The Pharaohs to Aesop Rock or Dialated Peoples—it’s precisely that sort of postmodern polymorphism that makes such joy out of listening to the genre. Apparently that freaky style is even more fun this time of year, when accompanied by the official accouterments of summer, stuff like psychedelic colors, a VW Microbus, a huge sound system and traditional beach attire. At least that’s true according to the poster for the The Grouch and Eligh gig going off at Launchpad (618 Central Ave. SW) on Tuesday, July 31 as part of the Summer Thrilla Tour. Listeners can be assured that their attendance will qualify as a cool July action-oriented activity. After all, you can dance your ass off to mystically meaningful, graciously groovy tunes like “Dr. No” or this year’s surprise slammer, “Pain on the Break.” I’m so there. 8pm • $20 • 13+.