As an experiment to find out just how many people you can pack into Marathon Music Works, the Scene-sponsored summer music series Sounds Like Summer kicks off by putting two of the city’s most popular club draws on the same bill. In this corner: the ’80s, the decade of hair metal, Heaven 17, college radio and roots rock — ably represented by Mike Grimes’ redoubtable Guilty Pleasures band of all-star sidemen and veterans of the local club scene. Across the arena, flying the flannel, it’s the ’90s — the province of My So-Called Band, whose stalwarts include Tennessean music writer Dave Paulson, ubiquitous bassist Keith Lowen and Ben Folds drummer Sam Smith. If you think you’re just gonna sit there when Grimey busts into “Pink Houses” or Paulson and crew piss the night away “Tubthumping” — pour one out for the dearly departed Chumbawamba — you’re in for a rude awakening, as well as one hellacious night of liquored-up sing-alongs. Up next: the mighty Guided by Voices July 26, followed by Ledisi and Eric Benet Aug. 2.