Here's a copy of Mark Prellberg's Free Flight, Dove Recording Studio 2LP compilation. To the left is an acetate LP containing 6 cuts by The Magpies, including their best cut featured on Free Flight, "Never See Her Again". There are 5 other Magpies tunes from the same session, all unreleased. "Everybody's Fool" is not on the LP acetate, but was the flip side of a different 7" acetate of "Never See Her Again".
Top centre is the legendary acetate "He's In Love With Himself" / "I Just Don't Know". When Free Flight was released, the identity of the group was listed as "unknown artist" due to the absence of labels on the acetate. The group has recently been confirmed as The System, see link below.
http://minniepaulmusic.com/?page_id=6581
At top right is the Calico Wall's "I'm A Living Sickness" Dove acetate which was also never released in the '60s, but has been compiled several times since, including on 45.