Harper is part of the No Nukes group, which is against the expansion of nuclear power. In 2007 the group recorded a music video of a version of the Buffalo Springfield song "For What It's Worth". Harper's collaboration "Boa Sorte/Good Luck" with Brazilian singer Vanessa da Mata peaked at #1 in Brazil and Portugal. In Brazil it also won a highly coveted Prêmio Multishow for "Best Song" in 2008. Also in 2008, Harper participated in the benefit album Songs for Tibet. thumb|right|Harper discussing Lifeline in 2007 On August 27, 2010, it was reported that Harper had formed a band called Fistful of Mercy with Dhani Harrison and Joseph Arthur. Fistful of Mercy released their debut record, As I Call You Down, on October 5, 2010.
Harper is part of the No Nukes group, which is against the expansion of nuclear power In 2007 the group recorded a music video of a version of the Buffalo Springfield song "For What It's Worth". Harper's collaboration "Boa Sorte/Good Luck" with Brazilian singer Vanessa da Mata peaked at #1 in Brazil and Portugal In Brazil it also won a highly coveted Prêmio Multishow for "Best Song" in 2008. Also in 2008, Harper participated in the benefit alb.um Songs for Tibet. thumb|right|Harper discussing Lifeline in 2007 On August 27, 2010, it was reported that Harper had formed a band called. Fistful of Mercy with Dhani Harrison and Joseph Arthur. Fistful of Mercy released their debut record, As I Call You Down, on October 5, 2010.