My fiddle also has the same motto inlaid on the back (in very fine workmanship):

   IN SILVIS
   VIVA SILUI

    CANORA

JAM MORTUA
    CANO

The professor I took it to, decades ago, said that is 16th century church Latin and translated thus:

"In the wood ('same word for forest or lumber') I lived, silent.
"Canora doesn't translate.
"Now that I am ['present perfect participle'] dead , I sing."


If Canora doesn't translate, and cano means I sing, then I consider Canora to be the name given to the fiddle, something like Songstress.

My fiddle is, incidentally, a Guarnerius, identical in shape to photos of Ole Bull's Guarneri, but with a single-piece front with the fine grain on the extreme right.