the bloody assizes ( `` i 'll hang for a sheep ... '' ) ( commemorating judge jeffreys , who brought violent justice to the rioters of monmouth in 1685 ) they will not only play a set which they dedicate , somewhat inappropriately , given the nature of said set , to `` jubal , the father of music '' , they will also provide instrumental accompaniment for the various games and rituals customary on the day of the vernal jamboree , july 1st .