Gong - "I Never Glid Before" (1973)
I would have liked to have used this track as an commemoration of the late Daevid Allen (here), but was precluded from doing so by the fact that he didn't actually write this one, it being composed by guitarist Steve Hillage.
But it's been my earworm of the week, so here you are anyway.
(This is supposedly the remastered version from just over a decade ago, but I think that the vocals are now way too far back in the mix on it. For the sake of clarity - if that's the word I'm looking for, which it isn't - you can find the lyrics here).