ラジオから聞こえてきた音というと、こういうのもありましたよ。
旺文社 大学受験ラジオ講座 OP 1983年11月14日
1983年11月14日 文化放送 0:30〜1:30?
旺文社のラジオ講座は中身は聞いていませんでした。BGMですね。
そういえばJ B ハリスっていう人、覚えています?
本名は平柳秀夫さんっていうんですよ。生粋のアメリカ人かと思ってましたよ。

Harris was born to an English father and Japanese mother in Kobe on 4 September 1916. His father was a Far East correspondant for the Times newspaper. Just after he was born, they moved to Yokohama. After the Kanto earthquake of 1923, his family moved to America, but came back to Japan when Harris was twelve.
Harris could speak Japanese, but never learnt to read or write it. Harris's father died suddenly in 1933, when Harris was sixteen. Harris took Japanese citizenship under the name Hideo Hirayanagi5 so that he and his mother could continue to live together in Japan.
Before the war, as tensions increased, Harris was repeatedly arrested by the "Kempeitai", the Japanese security police, as a suspected spy.
He passed the medical exam for the Japanese military, despite looking to the Japanese like a foreigner.
Harris thought that, because he was a native English speaker but could only speak, and not read, Japanese, he'd be an interpreter.
After the war, Harris was lucky enough to be returned to Japan and was glad the war was over.
Harris could speak Japanese, but never learnt to read or write it. Harris's father died suddenly in 1933, when Harris was sixteen. Harris took Japanese citizenship under the name Hideo Hirayanagi5 so that he and his mother could continue to live together in Japan.
Before the war, as tensions increased, Harris was repeatedly arrested by the "Kempeitai", the Japanese security police, as a suspected spy.
He passed the medical exam for the Japanese military, despite looking to the Japanese like a foreigner.
Harris thought that, because he was a native English speaker but could only speak, and not read, Japanese, he'd be an interpreter.
After the war, Harris was lucky enough to be returned to Japan and was glad the war was over.
こんな感じだったらしいですよ。
さー、共通一次、がんばるぞー(笑)
この本の反対側の表紙の写真がコレ。

日本語もしゃべれたが頭で考えるのは英語だったそうなので、国籍こそ日本でもJBハリスさんは名前の通り、終始イギリス人だったのでしょう。
なお、この本には 後藤新樹 訳 とありました。