You can never have enough cowbell, just ask Albert Bouchard, founding member of Blue Oyster Cult. See the hard rock band perform at the Suffolk Theater in Riverhead and listen for a lineup of their hits, including the cowbell fan’s favorite, “Don’t Fear the Reaper,” 8 p.m. Saturday, Jan. 12, at Suffolk Theater. Doors, bar and restaurant open at 6:30 p.m.