I was listening to

Shaban & Käptn Peng - Von Form Zu Form https://www.youtube.com/watch?v=p9BXI4hGr6k

and thought that the background track sounds very soviet. So I tried finding it by searching "ля-ля-ля-ля-ля-ля пам пам пам-пам-пам".
Google returned no relevant results, but I had luck with yandex (which I would normally avoid like the plague), which gave me a lead towards the source:

Волшебный цветок - Клара Румянова - мультфильм "Шелковая Кисточка" https://www.youtube.com/watch?v=RmhInXsTr0M

Hope this gets indexed so that some curious soul from the future has an easier time finding out than me.

Feel free to share it on reddit cause I have no account there.