postsemgirl:
If halacha was agreed upon across the board, there would be need for very few seforim. Check out a public Torah library and see how many halacha seforim they have, you will be in for quite a shock. I can recommend a few if you’d like. As far as the identity of the gedolim, it may come as a surprise to you, but not every Jew who observes the mitzvos has the same godol and posek. Each constituency and their godol, nahara nahara upashtei. It’s been that way for a few thousand years and you should learn that fact and accept it. The alternative is bigotry, hatred and prejudice , all ostensibly leshem shamayim, but in actuality avodah zarah.
You are right, a person should be careful what music he/she listens to. Let that person decide for him/herself.