mystery pic

A query arrived this morning from a UK publisher concerning this:

I'll put a bigger version of it behind the cut (see below). The publisher wants to reproduce the image (for obvious reasons), but has no knowledge of the artist or copyright-holder beyond that the image once appeared in a Paper Tiger book -- hence his tracking down of me. What he didn't know until I told him was that I left PT several years ago and that, more recently, the imprint's owners have told me that it's now essentially defunct. (Yes, okay, I have had occasional maniacal fantasies about reviving it, but . . .)

At first glance, I thought it might be very early Ron Walotsky (he went through a "psychedelic phase" where he did some rock posters), but the fact that it's a UK concert makes this unlikely, and besides the style isn't quite right. (Alas, Ron's no longer with us to be asked.) Nor does it look like, say, a Roger Dean piece.

Anyway, if you recognize it, please let me know. 

( click here for a bigger version of the mystery pic )