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 16 August 2011, "Minecraft: Pocket Edition" was released for the Xperia Play on the Android Market as an early alpha version. It was then released for several other compatible devices on 8 October 2011. An iOS version of "Minecraft" was released on 17 November 2011. A port was made available for Windows Phones shortly after Microsoft acquired Mojang. The port concentrates on the creative building and the primitive survival aspect of the game, and does not contain all the features of the PC release. On his Twitter account, Jens Bergensten said that the "Pocket Edition" of "Minecraft" is written in