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 that at first he was "too afraid to mod Minecraft at all", but learned to appreciate it when he realized that modding "Minecraft" is "pretty forgiving". Eddy does nevertheless mention that he feels Mojang's fast development pace regarding the main game has slowed down the progress of the most popular mods. Similarly, Benjamin Abbott of "Metro" agrees that adding mods to "Minecraft" is "a thorough pain in the backside", though he concedes that "the result is usually worth it". Matt Smith of "MakeUseOf" says he is disappointed with most of the "Minecraft" mods available, claiming they don't modify the game