The songwriters behind X-Factor 2010 winner Matt Cardle’s “Amazing” are suing Ed Sheeran for plagiarism given the uncanny similarity of their song to the hit single “Photograph.” The lawsuit was filed on Wednesday.

Sheeran is facing a US$20 million (AU$26.6 million). Songwriters Martin Harrington and Thomas Leonard claim that the resemblance between “Photograph” and “Amazing” is too much to miss. The court documents specified that Sheeran’s song has 39 identical notes with their composition.

“Given the striking similarity between the chorus of Amazing and Photograph, (the) defendants knew when writing, publishing, recording, releasing, and distributing Photograph that they were infringing on a pre-existing musical composition.”

Harrington and Leonard are represented by lawyer Richard Busch, who successfully liquidated US$7.3 million (AU$9.7 million) from Robin Thicke’s “Blurred Lines,” which was said to be plagiarised from Marvin Gaye’s “Give It Up.”

“My clients are professional songwirter,” said Busch, according to The Hollywood Reporter. “Their work is their life, and I am honoured that they have trusted me with this very important case."

The lawsuit on Sheeran cited that the chorus is where anyone can pinpoint the similarities.

Watch: Ed Sheeran – Photograph (Official Music Video)

Source: YouTube/Ed Sheeran

Whereas Sheeran’s “Photograph” garnered a whopping 209 million views, Cardle’s “Amazing” was only viewed 1.7 million times.

Watch: Matt Cardle – Amazing

Source: YouTube/MattCardleVEVO

“Kiss Me” singer Sheeran has not made a comment about the hefty fine he is facing if proven guilty. Meanwhile, Cardle turned to social media to wash his hands from the lawsuit.

“Amazing” singer Cardle is scheduled to be in UK for his “Intimate & Live” tour this June and July.

Sheeran’s “Photograph” is the main soundtrack for “Me Before You” and it is “heavily promoted by the movie,” as court documents say.

More updates on Sheeran’s lawsuit are expected soon.