Ed Sheeran faces copyright infringement claims in high-profile trial.

The heirs of Marvin Gaye's co-writer of the song "Let's Get It On" are suing Ed Sheeran for copyright infringement, claiming that his song "Thinking Out Loud" violates the soul classic's copyright. The lawyer for the heirs claims to have "smoking gun" proof that Sheeran merged the two songs in concert. Sheeran's lawyer denies the allegations, stating that Sheeran and his co-writer wrote their song independently. The trial is expected to last up to two weeks.