Invisible was a song later included as a hidden track on which thirteenth U2 album?
Songs of Innocence (U2 album) Songs of Innocence is the thirteenth studio album by Irish rock band U2. Released on 9 September 2014, it was produced by Danger Mouse, with additional production from Paul Epworth, Ryan Tedder, Declan Gaffney, and Flood. The album was announced at an Apple Inc. product launch event and released the same day to all iTunes Store customers at no cost. It was exclusive to iTunes, iTunes Radio, and Beats Music until 13 October 2014, when it received a physical release on Island and Interscope Records. The digital release made the record available to over 500 million iTunes customers, for what Apple CEO Tim Cook marketed as "the largest album release of all time".
Invisible (Christina Grimmie song) "Invisible" is Christina Grimmie’s first posthumous single which was released on Friday, February 17, 2017, by UMG and Republic Records. The song was scheduled to be released on Tuesday, February 14, 2017 but due to Christina getting the major record deal for her posthumous music with her family they decided to release it on Friday, February 17, 2017, for #NewMusicFriday and because every artist with a record deal has to release their new music on a Friday. It was premiered exclusively on Elvis Duran Show on February 16, 2017 alongside the lyric video that was uploaded on Grimmie's official YouTube channel the same day. Later, the single was supplemented with an animated superhero music video on March 10, 2017.