Now here's an odd one and an extremely rare odd one at that!  'Revelry At Cambusnethan Priory' by Revelry.

It looks like a souvenir from a medieval banquetting evening, but far from it.  It's actually excellent full group electric folk performing contemporary and traditional material. They even cover 'Lady Eleanor'.

The sleeve is an excellent busy drawing and to add to the intrigue the number in the matrix is DER 1393 which suggests that it was pressed by the legendary Deroy Company.

LP format 

Label:  Priory;  Catalogue No:  PRST 0001

Country of Origin:  UK;  Stereo edition

Condition:  EX/EX