 In 2017 Gädker could be heard in a scenic production of Handel's "Jephta" at the Landestheater Detmold.In 2011 Gädker founded the international song recital series "klangwerk LIED" Freiburg together with the soprano Katharina Persicke and the pianist Nicholas Rimmer.Together with Persicke and Rimmer he is the artistic director of this series, which was under the patronage of the American song accompanist's Irwin Gage until his death in 2018.