Minecraft led to Persson becoming one of "Forbes" "World's Billionaires". "Minecraft"s music and sound effects were produced by German musician Daniel Rosenfeld, better known as C418. The background music in "Minecraft" is instrumental ambient music. On 4 March 2011, Rosenfeld released a soundtrack, titled "Minecraft – Volume Alpha"; it includes most of the tracks featured in "Minecraft", as well as other music not featured in the game. The video game blog Kotaku chose the music in "Minecraft" as one of the best video game soundtracks of 2011. On 9 November 2013, Rosenfeld released the second official soundtrack, titled "Minecraft – Volume
Markus Persson adventure game. Professionally he had worked as a game developer for King for over four years, until 2009. Afterwards he worked as a programmer for Jalbum. He is also one of the founders of "Wurm Online", though he no longer works on it. Outside of work, he has made seven games for competitions. He is the central figure of "", a documentary by 2 Player Productions about the rise of "Minecraft" and Mojang. Persson is a member of the Swedish chapter of Mensa. On 13 August 2011, he married Elin Zetterstrand. On 15 August 2012, he announced that he was