If you dont know how to categorize a band, just call it punk. From Blink-182 to Green Day, musical acts are constantly given the label for lack of a more appropriate, genre-defining term.
Houston-based trio O Pioneers!!! tends to get thrown under the giant punk umbrella, as well. However, its brand of harmonic, broken-down rock vocalist Eric Solomon shouts in a choking on gravel style similar to Against Me! is far closer to Hot Water Music or Dillinger Four than any music that broke in 76. If anything, O Pioneers!!! deserves at least one listen solely for distributing its recent album, Neon Creeps, via 250 lime-green cassette tapes.