sold a further 20,000 copies in the USA. Holden has performed with Paul Young, Belinda Carlisle, and Bonnie Tyler. In addition, he has worked with such bands and artists as Boyzone, B*Witched, Peter Andre and Backstreet Boys. His rendition of "The Star-Spangled Banner" garnered such respect that he was invited to sing it for President George W. Bush at the White House. The High Kings In June 2007, Holden was invited to become a member of the High Kings, then a new Irish ballad group featuring Brian Dunphy, Finbarr Clancy and Martin Furey. Their debut CD was released on EMI in February 2008 and hit No. 2 on the Billboard world music charts, as well as hitting the top spot on various Amazon Music charts. It reached No. 7 in their native Ireland and has since been certified platinum. There have been three sold-out tours of the US and Ireland. Holden performed solo in March 2009 with the Kilkenny Gospel Choir, at St Mary's Cathedral, Kilkenny. He endorsed Optilase Laser Eye Clinic in a TV advertisement. In August 2009, the Sunday World and Daily Mirror newspapers reported that Slash was headhunting Holden to replace Scott Weiland as the new Velvet Revolver lead vocalist. Sources close to the LA-based group confirmed that Holden had been in talks and material had been recorded. At the Keith Duffy Masquerade Ball on 5 December 2009 in Dublin, Holden was one of the performers, as were Aslan and Keith Barry. Holden mentored Irish ballad group "Na Fianna" for The All Ireland Talent Show. On 9 October 2009 Holden was one of seven Irish celebrities to spend a week in Tanzania while climbing Mount Kilimanjaro in aid of Our Lady's Children's Hospital, Crumlin. An RTÉ television documentary on the event was recorded for broadcast in 2011. The documentary was shown on RTÉ 1 television on 18 July 2011. The High Kings album Friends for Life was released in 2013, and the opening track was a Holden original called "Oh Maggie", which became the most-played and downloaded song from the album in Ireland, the UK and particularly Germany. The album reached number 5 in the Irish Top 40, Number 3 on Billboards World Albums chart. On 30 January 2017 at the Sunday World Entertainment Awards, the High Kings were presented with the final award of the night: "Outstanding achievement in Irish Music around the world". TV3 invited