Instrumental 1969 Promo 45 Studio Arby's This was a promo only 45 ep for Arby's Resturants. Arby's started out in Youngstown, and the EP contains four different versions of the same song Swing Over, an instrumental. Glass Harp did one cut and the remaining three were done by three other groups in different styles (jazz, etc.). The EP came with a sleeve with a crude drawing of a cow.