In the early- to mid-1970s, they were all the rage among certain of my peers, but I mostly listened to Bob Dylan in those days. If you have students who are fans of heavy metal music, then this reading on Black Sabbath and the vocabulary-building and comprehension worksheet that accompanies it will be, I expect, of high interest to those students. After all, Ozzy Osbourne still occupies a relatively prominent place in the culture.
If you find typos in these documents, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.