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
Crown and Council "Crown and Council" was not originally intended for public release; Pettersson, an artist who joined Mojang to work on Scrolls in 2011, used the relatively simple project to learn to code. He believed that even if the game was to be distributed one day, it would be rebuilt by "real programmers". The game was worked on over multiple months and used bits of code taken from other Mojang projects. Pettersson credits "Minecraft Pocket Edition" programmer Aron Nieminen as his programming mentor. It is the first game developed by Mojang that is released on Steam, although Mojang published Oxeye Game Studio's