Bloodshy & Avant are a Swedish songwriting and production duo consisting of Christian "Bloodshy" Karlsson and Pontus "Avant" Winnberg. They have worked with many prominent artists, including Britney Spears, Kylie Minogue, Ms. Dynamite, Madonna, Jennifer Lopez, Katy Perry, Kelis, Girls' Generation, Christina Milian, Sky Ferreira, Hikaru Utada and BoA. In addition to their production work, Karlsson and Winnberg are also members of the synth-pop group Miike Snow, alongside lead vocalist Andrew Wyatt.

Lars Christian Karlsson, also known by his stage name Bloodshy, is a Swedish DJ, percussionist, record producer and remixer known for his work with the musical groups Bloodshy and Avant, Miike Snow, Ingrid, and Galantis. He started his international music career as one half of the electro pop duo Bloodshy & Avant with Pontus Winnberg, producing and co-writing tracks for pop stars such as Madonna, BoA, Kylie Minogue, and Katy Perry. Bloodshy & Avant notably co-wrote and produced Britney Spears' single "Toxic", which earned them a Grammy Award for Best Dance Recording in 2005. While continuing to work with Bloodshy and Avant, Karlsson also became a member of the indie pop band Miike Snow around 2007. Miike Snow, the group's debut album, was released in 2009, and peaked at number 11 on the Top Electronic Albums chart in the United States. Miike Snow won the 2011 European Border Breakers Award, and their second album Happy to You reached No. 1 on the Belgian Heatseekers Albums Chart and 43 on the Billboard 200.