I feel very similarly about Zeppelin I myself. My best friend had discovered it, and copied their cd onto a tape for me. I was blown away by it. It was really the first album that showed me that music can be so much more than the pop I was listening to on the radio at the time. It was really the album that encouraged me to explore music for myself, a journey I am still on. It also showed me that music didn't have to be "new" to be great. The thing that stood out to me the most was how much I felt they were really making the music they wanted to, instead of what they thought people wanted. I could tell it was coming from something different than the pop I was hearing at the time, that they weren't just making it because they thought I would buy it. I didn't know anything about the machine that is the music industry at the time, but I knew that I had found something special that I would love forever.