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Source: https://danbooru.donmai.us/forum_posts/189551

Soundtrack

Description from Genius:

"Колыбельная" is from the soundtrack of Russian movie Путевой обходчик (Trackman). Composed by Lev Zemlinsky and written by Rustam Saitov.

The clip is from Insiders, 2017-11-19.

Made by Micah (akarui.kitsune). Posted to Discord on 2021-02-21.

Original: https://danbooru.donmai.us/posts/4970530

Original: https://danbooru.donmai.us/posts/3565706

As identified by hmshenry on discord, the song is Vendex - Sanguine Fountain