I listened to a lot of what people classed as psychedelic, but to me it was all just rock music. Hendrix, later day Beatles, Airplane, Floyd, Doors... a lot had to do with how deep the lyrics were and whether they were trippy enough to make you think. And of course the LSD connection. Clothing that was considered weird at the time, art on album covers... Those were my mid to late teen years and I had tons of those albums that I wish I still had. It ran alongside the British Invasion years so closely that I had records in crates separated by the turntable so British music was in one stack and psychedelic was in the other. And a 3rd stack for heavier stuff, soul and blues. BS&T were right around then, The Blue Project, Mayall, Cream... many of them could have been in all 3 stacks!