"Light Up the Sky" is the first single from Yellowcard's album Paper Walls. The live acoustic version was first heard on March 30, 2007, at their concert at the Troubador in West Hollywood, California. It was then played electric in later shows. On May 15, 2007, the fully mixed album version was put on their Myspace page. It was released on iTunes on June 5, 2007, and it was the most added single to US Alternative/Modern Rock radio stations for the week ending June 8, 2007, and peaked at number 41 on the BillboardModern Rock Tracks chart. The song also reached number 32 on the Adult Top 40 chart.
The video, directed by Lisa Mann, premiered on Yahoo! Music on July 10, 2007. It has a very dark theme, with the band playing the song in a dark wasteland. However, as the song continues, an orange rain begins to fall and 'light up the sky' for those that live in the gloomy world.