Simon Wiedemar was possibly Thomaskantor. In June 1559 he was added to the Kantor Melchior Heger as Adjunct. In 1562 Melchior Heger requested his parting; however, he still remained in the office until 1564.
Source: Thomanerchor Leipzig (January 2006); English translation by Aryeh Oron (February 2006):
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