It turned out that Radio Record keeps all their music publicly available, and you can download from http://history.radiorecord.ru/air/.
To define what stations to download just update the CHANNELS variable in the settings.
To build and start a container just run:
# DST is where music will be downloaded to
DST="/media/dst" docker-compose up -dI'm not responsible to any legal issues if you decide to use their files in other ways rather listening privately.