Simeon Bar-Isaac

c. 950

Born in Mainz, Germany. An important scholar of his time. As a paytan he composed yozerot, kerovot, selihot, hymns, and rashuyyot le-hatanim. It is probable that he sang his piyutim himself. His piyutim bare traces of the language found in early piyutim, and they are marked by the pain of the persecutions of the Jews in Bar-Isaacs' lifetime. 

Sources: Encyclopedia Judaica

Yetzaveh Tzur Hasdo

The piyyut Yetzaveh Tzur Hasdo by Simeon Bar-Isaac in Invitation to Piyut website. In the tradition of Vorki Hassidism, performed by Sara Friedland Ben-Arza.