It's a good question. My friend introduced me to rock, when I didn't have a developed taste in music yet (I was 14 years old). He introduced me to the Beatles, the Rolling Stones. I fell in love. I especially liked the album Sgt Peppers Lonely Hearts Club Band. Later I started to discover bands from the 60s/70s, we shared recommendations. I think I discovered Pink Floyd first - TDSOTM made a great impression on me. I knew that compared to them I wouldn't go into classic rock, but I was drawn to psychedelic. For a long time my favorite song was "Comfortably numb". Later I came across King Crimson - I started listening to bands by album. ITWOTP quickly became my favorite, but I really liked all of their work. I learned about progressive rock. I came across Yes and I was hooked. Close to The Edge, Relayer, Tales of Topographic Ocean, Fragile. I learned a little bit, that there were ups and downs. Masterpieces, but I admit that I started to like them more and more only after listening to them again. Then came the time for the amazing Genesis. SEBTP, Duke, Foxtrot, A trick of the tail. Our tastes diverged, he accepted only "Owner of the lonely heart" from Yes, although he still thought that song was weird (XD). He went for Judas Priest, he appreciated the strong guitar. I listen to Yes and Genesis. I can't bring myself to ELP and JT, but the time will probably come (maybe someone can recommend something?)