What is the fine-grained topic of the following text: As a special highlight, the JSB Ensemble performed two Bach cantatas under the direction of Helmuth Rilling, founder of the Internationale Bachakademie Stuttgart, in the music festival series »Sichten auf Bach« (Views on Bach). Only return the topic.
JSB Ensemble's performance of Bach Cantatas under Helmuth Rilling in the music festival series "Sichten auf Bach".