https://www.intervalsignals.net/
Interval signals, signature tunes, airchecks and identification announcements
from international, domestic and clandestine radio stations around the world
Interval Signals Online is a collection of audio clips of radio stations throughout the world, featuring airchecks, identification announcements, jingles, signature tunes and of course interval signals. The site is a strictly non-commercial research project aimed at press and broadcast editors, media researchers, educational institutions and devoted radio listeners, to facilitate the identification of radio stations.