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
Minecraft mods Around November 2011, the mod "Forge" was released. Rather than adding new gameplay features to "Minecraft", "Forge" allowed players to be able to run several client-side mods simultaneously. Before becoming compatible with "Forge", "IndustrialCraft" and "BuildCraft" would not run side-by-side, because both of them needed to overwrite the same "Minecraft" base Java files. "Forge" ended the necessity to manipulate these files, allowing separate mods to run together without requiring them to touch the base source code. After "Minecraft" received its first full release in November 2011, the game's modding community continued to grow. In February 2012, Mojang hired developers of