Vol. 6: The Rainbows: origins are still mysterious, but they had nothing to do with the better known Rainbows on CBS.
Vol. 7: We Four were a Scandinavian group. The single was first released in Sweden
Vol. 9: The Sheapes came from Switzerland. The Major Shouts: Correct song title is "Gammlin' Girl".

You can find the liner notes and the track lists of all "PKP"s right here. Vols.1,2 & 8 had the liner notes printed on the backside of the sleeve, the others had a insert (which sometimes may got lost, so I decided to publish the liner notes of every record). Just click on the pictures, to get the information that you need.