What are the heaviest Psychedelic songs?

anything by the Dead (the Grateful Dead), Phish, The Airplane (Jefferson airplane), Bread would probably be good for you. there's a great psychedelic movie that not a lot of people know about or remember. It's called Psych-Out, it's from the 1967, I believe. Jack Nicholson stars in it - really good tripped out movie - check it out