Thanks to a link on Fark for this: Billy and the Boingers MP3s. I owned the book that contained the flexidisc with these songs, but we could only play it on my childhood portable record player. Hope these sound better than they did on that record player; I had to weight the flexidisc with a penny to keep it from slipping, and it still didn’t rotate at a consistent rate which lent a warbly quality to the music. If these sound halfway decent, they’re a shoo-in for my next 80 mix.