April Wine is great, Harder... Faster and First Gance were killer albums. The song on the tape before Cool the Engines was Roller, i gotta go listen to that song now i think.
Another over looked album is Gary Wright's The Dream Weaver. They only play Dream Weaver and Love is Alive, but the whole album is awsome.
Blue Oyster Cult are another group over looked, Mirrors, The Revolution by Night, Fire of Unknown Origin and Agents of Fortune, I gotta go home right now and dig those out.