High Quality Content by WIKIPEDIA articles! Songbird: Rare Tracks Forgotten Gems is the name of a 2007 box set of songs personally selected by Emmylou Harris: "I`ve selected not greatest hits, but personal favorites: that, with a few exceptions-have never appeared on any other compilations, but were important gems in the string of pearls that each album strives to become. Also included are special collaborations, unreleased live and demo tracks, as well as contributions to tribute projects, which I may now gather into this fold.”