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 official modding application programming interface (API). Texture packs that alter the game's textures and HUD are also available, as created by the community. In July 2013, texture packs were replaced with "resource packs", which have the same role as texture packs, but allow custom audio as well. Players are also create their own maps, which often contain specific rules, challenges, puzzles and quests, and share them for others to play. In August 2012, Mojang added adventure mode for custom maps and in October 2012, Mojang added command blocks, which were created specially for custom maps. In February 2016, Mojang added