Hardcore punk, post-hardcore, hardcore metal... it's getting increasingly difficult to identify what group belongs to which subgenre circa the early 21st century--a case in point being the Ontario-based quintet Alexisonfire. On their fourth full-length overall, 2009's OLD CROWS/YOUNG CARDINALS, there is a bit of all three aforementioned styles, with a healthy dose of melody stirred into the sonic blender for good measure. This hodgepodge approach should bring Alexisonfire some U.S. rock radio airplay (they already scored their breakthrough hit back home on their previous album, 2006's CRISIS), especially such standout tracks as the leadoff single, "Young Cardinals," as well as the album-opening "Old Crows," "The Northern," and the surprisingly tranquil and sweetly sung album closer, "Burial."