The world’s finest accordion players descend on Vienna for 18 concerts at 14 different venues, kicking off with Austria’s finest Otto Lechner at the Jugendstil Theater in the grounds of the Steinhof psychiatric hospital. The festival includes practitioners of Klezmer, Balkan styles and traditional English, Scottish and French music. From further afield, there is a Cajun night at the Szene Wien and a tribute to the great Astor Piazzola. The festival conludes with a performance at the Konzerthaus by Alan Bern and John Zorn collaborator Guy Klucevsek.