Radiohead are suing Lana Del Rey, insisting she has copied their 1993 track 'Creep'.
Del Rey says the British rock band is claiming copyright infringement for similarities between their hit song and her 2017 track, 'Get Free'.
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Rumours of the lawsuit emerged online on Sunday.
On Monday, Lana Del Rey confirmed the news on Twitter.
"Although I know my song wasn't inspired by Creep, Radiohead feel it was and want 100% of the publishing - I offered up to 40 over the last few months but they will only accept 100. Their lawyers have been relentless, so we will deal with it in court.
A Radiohead spokesperson had earlier told The Sun "both teams are trying to thrash it out behind the scenes to prevent going to court."
The two songs share the same chord progression, though Del Rey's is in the key of A while Radiohead's begins on G.
'Get Free' is the third most popular song from Del Rey's 2017 album, Lust For Life, currently on the Billboard Hot 100.