Here are a couple of fun ads from the 1970s advertising two of P-Funks albums, Funkentelechy Vs. The Placebo Syndrome (1977) and GloryHallaStoopid (Pin The Tail On The Funky) (1979). As far as I know, these ads were never seen beyond the stage of P-Funk shows where they'd promote these records before the band came on.
