Sometimes a category is so big, you know going into the episode that the siblings are bound to disagree. This is one of those categories. Rock and roll is so diverse, so wide-ranging, and now with over 70 years of history behind it, that banging out the five best male rock vocalists of all time is a daunting task. Without question, some legendary vocalists won't make the cut. But will there be a surprise in the top 5? Listen to this explosive episode to find out!