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
Mojang title of ""Caller's Bane"". Mojang began its tradition of developing smaller projects for the Humble Bundle Mojam with a shoot 'em up strategy game with steampunk and Ancient Egypt themes called "Catacomb Snatch". 81,575 bundles were sold, raising US$458,248.99, of which all proceeds were given to four charities and non-profit organizations, including , Child's Play, Electronic Frontier Foundation, and American Red Cross. Both the genre and theme were picked by a survey on Mojang's website (combination of the highest and lowest voted of each). The following year, three mini-games were simultaneously developed for the Humble Bundle Mojam 2. Until July