The Aston Magna Music Festival season gets under way June 19-21 at three Northeast venues, with an engrossing season of early music for audiences of all ages. Sample what’s to come with this 2012 archive interview from WGBH radio, with Aston Magna Artistic Director Daniel Stepner and the Aston Magna ensemble. Stepner’s passion for the history of the music is on equal footing with the music itself.