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 2 Player Productions. In 2014, an attempt to crowdfund a fan film through Kickstarter was shut down after Persson refused to let the filmmakers use the license. A Lego set based on "Minecraft" called Lego "Minecraft" was released on 6 June 2012. The set, called "Micro World", centres around the game's default player character and a creeper. Mojang submitted the concept of "Minecraft" merchandise to Lego in December 2011 for the Lego Cuusoo program, from which it quickly received 10,000 votes by users, prompting Lego to review the concept. Lego Cuusoo approved the concept in January 2012 and began developing