This is a fictional story but is built on the realities of the 1940s when Jews in Poland were persecuted and many murdered by the Nazis. The title of the movie is a reference to a way to remember the dead until they could all be written down. They created a Song of Names and in this story is said to take 5 days to sing completely.
The story spans about 1939 to about 1986. It starts with a young boy (David), a violin prodigy, who is placed with a British family in London to be able to study violin while his family return to Poland. He and the family's young son (Martin) eventually become almost like brothers.
In 1951 when the boys are in their early 20s, and David is set up for a concert, he doesn't show up with no clue what happened. Then 35 years later Martin is judging a musical competition and sees a young violinist with a mannerism just like David's, that sparks his search for David.
The reasons are complex and Martin eventually learns what happened. It is a good story that ultimately relies on strong family and friendship bonds.
Good movie, my wife and I watched it at home on BluRay from our public library.