I don't identify psychedelic with "no arrangement and drugged, untight playing" (btw: not all drugs do that to you, Status Quo spent the late seventies in a coke haze, but man were they tight), but more with a certain tranquil, esoteric nature of the music. As such that Camel track is psychedelic to me. As is Pink Floyd and much of the older Genesis. ELP is a prog band that is not psychedelic to me as they are all about athletic, instrumental brawn - some of which I'm sure was coke induced!
My post wasn't that serious, I was just trying to say that there's room for Crack The Sky here too. The drug thing was a joke too.
ELP and coke definitely match, I think Keith was very honest about it in his book too.
English psychedelia was very tightly arranged at times, like the first Family album for example.
What drugs this band used I'm sure most of us don't want to know. Most likely they don't use any.
The mighty Magma:
Saw them in Finland in 2004. Played the then released "K.A" album and "Mekanik Destrüktiw Kommandoh".