Music by Dmitri Shostakovich and Pyotr Ilyich Tchaikovsky.
Russian Masters

Dmitri Shostakovich (Photo: Roger & Renate Rössing, Deutsche Fotothek, adjusted by Improvist, CC BY-SA 3.0 DE)
Playlist
Dmitri Shostakovich: Impromptu for Viola and Piano
Paul Neubauer, viola; Wu Han, piano
Pyotr Ilyich Tchaikovsky: Trio in A minor Piano, Violin, and Cello, Op. 50
Gilles Vonsattel, piano; Chad Hoopes, violin; Clive Greensmith, cello