Former Lostprophets frontman Ian Watkins was sentenced in December 2013 to 29 years behind bars for a number of child sex crimes he committed, but the musician is now seeking to appeal the length of the sentence.

According to the BBC, the Court of Appeal confirmed that an application for appeal was filed by Watkins earlier this week. In addition to his 29-year prison sentence, Watkins will spend an additional six years on extended license (probation) for his actions.

The 36-year-old Watkins was initially arrested in late 2012 along with two women who are the mothers of the children he abused. The women in the case received 14 and 17 years in prison for their actions. The rocker admitted the attempted rape and sexual assault of a child under 13, but pleaded not guilty to a rape charge. He also confessed to conspiring to rape a child, as well as several sexual assault charges and to making and possessing indecent images of children, as well as possessing a pornographic image of a sex act on an animal.

During the sentencing, Justice Royce stated, "Those who have appeared in these courts over many years, see here, a large number of horrific cases. This case breaks new ground. Any decent person … will experience shock, revulsion and incredulity." The judge went on to add that Watkins was "a corrupting influence" and that he had shown "a complete lack of remorse" for his actions.