Which song was the callsign for Stefan Verdemann's KWFM radio station in Urasawa Naoki's "Monster"?

The reason "Over the Rainbow" is the call sign for Stefan Verdemann's KWFM radio station in Naoki Urasawa's "Monster" is because it serves as a symbolic representation of hope and escape from darkness. The song, famously performed by Judy Garland in "The Wizard of Oz," is associated with a longing for a better world beyond one's current circumstances. In the context of the story, which revolves around themes of manipulation, evil, and the pursuit of justice, the choice of "Over the Rainbow" as the call sign contrasts the ideals of a utopian society with the harsh realities faced by the characters, offering a glimpse of hope for a brighter future.