In addition to his own albums, Hilton has also appeared on each of the three different "One Tree Hill" soundtrack albums, some with formerly unreleased material that cannot be found anywhere else. Most notably, the cover of the Ryan Adams song "When the Stars Go Blue", which was arranged into a duet with One Tree Hill star Bethany Joy Lenz for the show; also, a cover of "Missing You" by John Waite and the original track "You'll Ask For Me". In 2005, he was part of a 23-city concert tour along with Lenz, The Wreckers and Gavin Degraw. During the summer of that year, he opened for Hilary Duff on her "Still Most Wanted Tour".