found: Bredemeyer, R. Reiner Bredemeyer [SR] p1993:insert (Georg Christoph Biller; baritone)
found: Wikipedia, Nov. 30, 2018(Georg Christoph Biller; b. 20 September 1955; German choral conductor)
found: Wikipedia, March 17, 2023(Georg Christoph Biller; born September 20, 1955, Nebra, died January 27, 2022; German choral conductor, baritone, teacher, and composer)
found: Google knowledge panel, March 17, 2023(Georg Christoph Biller; born September 20, 1955, Nebra (Unstrut), Germany, died January 27, 2022, Leipzig, Germany)