Prince Charles
Prince Charles was serenaded by Dartmoor prison inmates. Pictured: Prince Charles and Minister of State for Courts and Justice Rory Stewart watch a 20 minute performance of Bizet's Carmen by members of the prison choir at HM Prison Dartmoor on March 23, 2017 in London. Getty Images/Marc Giddings

Prince Charles continues fulfilling his royal duties amid the shocking allegations made against him in Tom Bower's controversial "Rebel Prince" book.

On Friday, the Prince of Wales visited Dartmoor Prison in Princetown, Devon. Prince Charles was there to learn about a special project that aims to build the convicts' self-esteem through music.

The inmates showed off their talent by singing the "Carmen" and "Les Miserables" song, "Do You Hear the People Sing." Over a dozen prisoners performed as the Duke of Cornwall watched, Express reported.

According to Adam Green, the founder of the Prison Choir Project that aims to rehabilitate prisoners and ex-offenders who are suffering mental disorders, the project is a wonderful experience for the inmates. He also commended their singing talent. "They can really sing, they really can," Green said. "I think they would stand up against any professional chorus."

Green added that the inmates had "thrown themselves headlong into this opportunity and I think bettered themselves through music." They were also honored to sing and dance for the future king.

Kate Symons-Joy, who worked with the prisoners and played Carmen in their performance, described them as "committed."

"They are all so committed," she said. "We are very privileged to be here with them, but they also I think see it as a privilege that they are involved and they take it very seriously and support each other. It is quite amazing to watch actually."

Prince Charles' sighting comes just days after Bower made surprising revelations about him in his biography, "Rebel Prince: The Power, Passion and Defiance of Prince Charles." In the book, the investigative journalist claimed that the next-in-line to the throne has outrageous travel demands.

In addition, Bower also revealed that Queen Elizabeth II disapproved of his relationship with Camilla Parker-Bowles. The monarch and Prince Philip are reportedly also not confident with their eldest son's leadership skills. In fact, they apparently wanted to live longer so that Prince Charles will have a short reign and will "have little opportunity to damage the monarchy."

On Thursday, Bower made an appearance on "Good Morning Britain." During his guesting, Susanna Reid asked him if spoke with Prince Charles and if his book was a product of "hearsay." Bower said "no" to both questions, explaining, "I have spoken to people who were very close to him."