Hey now... let's not go knocking on the growling. Need I remind you all I growl? It's not easy and takes time and practice to develop. Sure you'll never catch a teacher that teaches growling, and that's fine, but it still takes time and dedication to keep from running out of breath as well as not ruining your voice. Just like any other type of singing. Besides, it works well with a lot of the stuff I write. Not all of it, but a lot of it.