I like to hear a softer, slower song from a hard rock band occasionally. Sevendust, for example. Most of the stuff is pretty heavy, but Lajon Witherspoon can actually sing pretty well, in my opinion, and their normal songs don't always let him show this. In general, though, there's nothing wrong with a ballad every now and then. If that wasn't okay, we wouldn't have songs like Stairway to Heaven, Nothing Else Matters, and November Rain.