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 (the Bedrock Edition), in the form of add-ons. Mods have influenced the main "Minecraft" game on three occasions. Mod developer Dr. Zhark added horses to the game through the "Mo' Creatures" mod. Later on he helped Mojang adapt horses for use in standard issue "Minecraft". Pistons were also originally a part of a mod too, but impressed "Minecraft"s creators so much that they added the feature to the main game. Mojang also admitted that they admired all of the work done on server side modding API Bukkit. In 2012, the Swedish company ended up hiring the lead developers of the