What is the fine-grained topic of the following text: Outstanding performers are being expected at the 23rd Magdeburger Telemann-Festtage, among them Daniel Hope and the Berliner Barocksolisten, Klaus Mertens and the Leipziger Barockorchester, Hans Christoph Rademann with the Gächinger Kantorei, Michael Schneider and his ensemble La Stagione Frankfurt, the italian Ensemble Cordia conducted by Stefano Veggetti, Florian Heyerick from Belgium, as well as Echo award winners NeoBarock and Dorothee Oberlinger with her Ensemble 1700. Only return the topic.
23rd Magdeburger Telemann-Festtage Performers