January 24, 2013 / Last updated : September 19, 2017 Portara Ensemble News Portara to perform for 7th annual Bachanalia festival Returning for a second time to Nashville’s annual Bachanalia festival, Portara Ensemble will present one of Bach’s most well-known and well-loved cantatas, “Ein feste Burg ist unser Gott” (BWV 80).