ClariS is a Japanese pop music duo which formed in 2009 with singers Clara and Alice from Hokkaido, who were in junior high school at the time. The pair began singing covers and submitting them to Japanese video sharing website Niconico between 2009 and 2010. ClariS later signed to SME Records and released their debut single "Irony" in October 2010. Three more singles were released between 2011 and 2012, followed by their debut album Birthday (2012). Birthday was awarded a Gold Disc by the Recording Industry Association of Japan for having exceeded 100,000 copies shipped in a single year. Six more singles were released between 2012 and 2014, which were featured on their second album Second Story (2013) and third album Party Time (2014). Alice left the unit following Party Time's release, and Karen joined ClariS in late 2014. ClariS moved to the Sacra Music record label under Sony Music Entertainment Japan in 2017.

Over the Rainbow is the debut album of child singer Connie Talbot, and was released 26 November 2007 by Rainbow Recording Company. Talbot, who had entered the public eye after her appearance on the first series of Britain's Got Talent at age six, signed with Rainbow, an independent label, after briefly recording with Sony BMG. Over the Rainbow consists entirely of covers of pop and Christmas songs, and was recorded primarily in a spare room in the house of Talbot's aunt, in an attempt not to interrupt Talbot's childhood by disrupting her regular activities. Although public appearances were initially kept to a minimum, Talbot did make appearances to promote the album, and performed in public several times after the British release.