SOPP556: Could you suggest a piece of music for organ which could be shared with a violin player

This question was sent by Maureen. And she writes: Dear Vidas, My brain won’t work!… Could you suggest a piece of music for organ which could be shared with a violin player. Fr. Benedict wants to play his violin at a Gaudy night which is usually on Epiphany Sunday. I’m not sure of his level of playing. I would take a guess and place him around grade 6 of Royal Schools of Music. He could be much higher but a monk who has a lot of responsibilities and little leisure time. Thank you so much; I do appreciate your help. Maureen