Inside was a single line: "The music is not in the notes, but in the silence between them."

For a musicologist obsessed with the "lost" recordings of the Soviet era, this file was the Holy Grail. It was rumored to contain a private, unedited rehearsal of Shostakovich’s 4th Symphony—a work the composer had withdrawn under the shadow of Stalin’s purges. Part 1 had been nothing but static and orchestral tuning, but Part 2 promised the music itself.

At first, there was only the hiss of old magnetic tape. Then, a voice—sharp, nervous, speaking in rapid Russian. It was Shostakovich himself, arguing with a trumpeter. The room felt cold as Elias listened to the ghost of a man terrified for his life.