Sinead O'Connor is done writing letters to Miley Cyrus. The singer says it was never about Cyrus, it was about the "murder" of the music industry.

On Oct. 4, O'Connor appeared on Ireland's "The Late Late Show" shifting her frustration from Cyrus to television singing judges like Simon Cowell.

"It's about music being murdered, it's not actually about Miley," O'Connor said to host Ryan Tubridy. "I feel sorry for the murder of music and rock 'n' roll, which has happened because of the industry. Because of Simon Cowell, Louis Walsh. They've murdered music. I stand to say it on behalf of every musician in the world, and they'll agree with me. The industry has taken over so much. The money-making side of it, that the sexualizing of extremely young people making records, and all the worship with money and bling and diamonds, all the Simon Cowell, Louis Walsh - it all amounts to the murder of music, and that's what concerns me."

O'Connor continued by shunning popular shows like Cowell's "The X Factor."

"There's a certain alarm that needs to be rung, and I know there are a lot of musicians around the country and around the world that will agree," O'Connor said. "The power of rock 'n' roll to change things, to move people, is being murdered by all this worship of fame, 'Pop Idol,' 'X Factor,' all this stuff. What I'm worried about is it's all about the visual, the pyrotechnics. The tits out...shake your ass. It's not about the song. That to me is quite sad."

Last week, O'Connor uploaded a public letter to Cyrus on her website, warning the star against being a "prostitute" for the music industry.

Cyrus responded with Twitter posts of O'Connor ripping up a photo of the pope during her infamous appearance on "Saturday Night Live," O'Connor's own tweets from Jan. 2012 where she displayed a need for psychiatric attention and a tweet questioning the Irish singers mental health.

"Before Amanda Bynes.... There was....," Cyrus wrote on her Twitter account.

O'Connor responded with another open letter to Cyrus, this time questioning Cyrus' insensitive decision to mock those with mental health issues.

"I mean really really... who advises you?" O'Connor wrote. "Have you any idea how stupid and dangerous it is to mock people for suffering illness? You will yourself one day suffer such illness, that is without doubt. The course you have set yourself upon can only end in that, trust me."

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