After getting started on Hendrix and The Who through my dad's record collection in the 80s my best mate Stu started stealing his brothers cassettes which included Faith No More, Red Hot Chilli Peppers, Slayer and Metallica so we copied all of them and pretty much wore out The Real Thing and Ride The Lightning.
After that it was Headbangers Ball and Raw Power which introduced me to grunge and a lot of alt metal including Helmet, Tool and Therapy?