Taylor Swift sings diss track on Scooter Braun's birthday in Cardiff

Taylor mocked Scooter Braun on his birthday during a Cardiff concert.

The crowd cheered when she sang about him talking behind her back.

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She combined "I Forgot..." and "Can't Have Nice Things" lyrics.

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Swift aims to regain ownership of her first six albums.

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Her masters were sold to Braun's company, angering her.

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She's re-recording albums to control her music

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Braun recently announced retirement as a music manager

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Swift premiered the unreleased song "I Hate It Here" live.

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She mashed it up with "The Lakes" from the "Folklore" album.

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