In Sachsenhausen concentration camp, Aleksander Kulisiewicz stores in his memory 770 songs created by his fellow deportees, repeating them continuously for years under his breath between his lips so as not to forget them. Aleksander becomes the "precious bridge" through which that music is saved. Martin Rosenberg is one of the men Aleksander met at Sachsenhausen. Today the enormous musical heritage composed in the camps has come down to us thanks to the work of Barletta pianist Francesco Lotoro, who for more than 30 years has traveled the world alone in search of all that music. A unique place in the world, it will finally return this immense heritage to humanity.