Long before his Broadway mega-hit “Wicked” hit the stage, songsmith Stephen Schwartz scored big with “Pippin.” His 1971 “Godspell” had been an off-Broadway triumph, but this new musical, produced on the Great White Way the very next year, was infused with the spirit of the era, not yet that far off from the summer of love. Now enjoying an exuberant production by Baldwinsville Theatre Guild, “Pippin” may show its age, but it’s still a very enjoyable rollercoaster ride of a show.