NEW YORK – English singer-songwriter Ed Sheeran, on trial for allegedly stealing from the Marvin Gaye classic Let’s Get It On for his own 2014 hit, told jurors he would be “quite an idiot” to perform the two songs together publicly if the copyright infringement claims against him were true.

Sheeran, 32, took the stand in a lawsuit by the heirs of Gaye’s co-author, Ed Townsend, who claim he lifted melody, chord progression, harmonies and rhythm from the older song for his 2014 Grammy-winning Thinking Out Loud.

Earlier in the day, a lawyer for the Townsends claimed Sheeran’s live performance of a “mashup” of the two songs shows how similar they are and is the “smoking gun” proving Sheeran ripped off Let’s Get It On.

“If I had done what you accuse me of doing, I would be quite an idiot to stand on a stage in front of 20,000 people and do that,” Sheeran said.

The trial, which began on Tuesday in Manhattan federal court, is being watched closely by the music industry, which has seen judges and juries wrestle in recent years with how to draw the line between musical building blocks available to all and the complex combination of elements that go into a copyright-able song.

Sheeran was called to the stand by lawyers representing Ms Kathryn Griffin Townsend, the biological daughter and heir of singer, songwriter and producer Ed Townsend, who died aged 74 in 2003, and the estates of two other family members.

Sheeran was frequently combative with lawyer Keisha Rice, particularly when she interrupted his answers, claiming they were not responsive.

“Am I allowed to answer the question that you’re asking me?” he asked in frustration at one point.

Ms Rice questioned Sheeran about the mashup video, part of which was played for the jury.

He said he often performs mashups of different songs and that many familiar hits are constructed from the same collection of musical elements, allowing them to be played together.

He pointed to the many mashups of English rock band The Beatles’ Let It Be and Jamaican singer Bob Marley’s No Woman No Cry. 

“It’s quite easy to weave in and out of songs,” Sheeran said.

Earlier in the day, Mr Ben Crump, another lawyer for the Townsend heirs, called Sheeran a “British upstart” who profited unfairly from Gaye’s and Townsend’s 1973 classic.

“This case is simply about giving credit where credit is due,” Mr Crump told jurors in his opening statement.

The heirs of Townsend are seeking unspecified damages from Sheeran, Atlantic Records and Sony/ATV Music Publishing. If they are found liable in this trial, a second proceeding will be held to determine damages.

Sheeran claims Thinking Out Loud sprung from a discussion between him and his writing partner, Amy Wadge, about elderly relatives who had lost spouses after decades together. Wadge, who is not named in the suit, is also expected to testify in the trial.

Sheeran stepped down from the stand after testifying for about an hour. He will be called by his own lawyers later in the trial when they present his defence to the infringement claim.

“Thinking Out Loud is about finding everlasting, unconditional love,” Ms Ilene Farkas, a lawyer for Sheeran, told the jury in her opening statement.

The lyrics and melodies of the songs are “very different”, she said.

And while both songs use a similar chord progression, so do many other popular songs, including some by American singer-songwriter Buddy Holly, American rock band The Beach Boys and The Beatles, Ms Farkas said.

The song is a work of “independent creation”, not copying, she said. “Ed Sheeran and Amy Wadge have been wrongly accused here.” BLOOMBERG