The singer behind the controversial Kill the PM song swore and joked about raping John Key's son before walking out of a live radio interview.

Former Home Brew singer Tom Scott was yesterday on Kim Hill's Playing Favourites segment of her Radio NZ show, where guests choose some of their favourite songs.

But things soured when Hill asked about the song Scott released with his band @peace during the election campaign, in which he sang about killing PM Key and having sex with his daughter, Stephanie.

Asked about the the lyrics, Scott said: "I mean obviously I regret what I said. I probably should have said I was going to rape his son."

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When asked if he had any regrets, he said: "I don't regret what I said actually. Screw that."

He also went on a tirade about Key, saying he "doesn't like the guy one bit".

"At the end of the day you don't have to worry about Tom Scott cos him and the working class got f****d," he said before apparently disappearing during a song.

When Hill came back on air she said Scott was "perturbed" by her questions. "Good on you, Tom. Leaving with the F-bomb, which is always a nice touch," she said.

Hill told the Herald on Sunday Scott had been informed it would be a wide-ranging conversation. "That's live radio ... Maybe he was just having a bad day."

The show's producer Mark Cubey said the network had had "a lot of feedback" about the show, though he did not know of any formal complaints.

"I think everyone was surprised," he said.