New England-born, New York-based experimentalists Magik Markers ascend to The Summit, 2210 Summit St., tonight for a gig with locals Swamp Leather. As my preview attests, this music is much more approachable than I expected, but don't show up expecting a Dr. Dog concert. Something tells me they like to get very abrasive in person. Doors open at 8:30 p.m. for this one, with music at 9:15 sharp. Admission is $8.