RADIO INTERVAL SIGNALS - "Radio Majak" (Russia) 

This is the interval signal of RADIO MAJAK, Russia. It's from the melody of the very known song, called "Moscow Nights".
RADIO MAJAK is one of the most popular radio stations in Russia.
I've played it with IPAD-App "Mellotronics-M3000" (preset "MK II Vibes")
Best regards,
Volker H. ;)