Basshunter announced the release of "Welcome to Rainbow" on 20 December 2005. Ultimately he
self-released it in Sweden on 1 April 2006. Basshunter wrote the lyrics and music; Fredrik Jansson mastered the songs. The artwork was produced by Djb Design. Within twenty-four hours, the song was downloaded an estimated 37,000 times. With this success, Basshunter received several proposals from music labels. In April 2006, he signed with
Extensive Music and
Warner Music Sweden, and on 9 May 2006, a shorter version of "Boten Anna" was released as a single. It was later included on Basshunter's second studio album
LOL (2006). According to information published on 8 June 2006, the song had been downloaded an estimated over one million times. New versions of "Welcome to Rainbow" and its hardstyle remix (renamed "Hardstyle Drops"), alongside the single version of "Boten Anna" appear on his fourth studio album ''
Now You're Gone – The Album (2008). In 2020 a fragment of the "Welcome to Rainbow" was played on the radio programme P3 Musikdokumentär'' broadcast by
Sveriges Radio. ==Track listing==