Doom (1993 video game)
The ability for others to create custom levels and otherwise modify the game using WAD files turned out to be a popular aspect of "Doom". Gaining the first large mod-making community, "Doom" affected the culture surrounding first-person shooters, and also the industry. Several future professional game designers started their careers making "Doom" WADs as a hobby, among them Tim Willits, who later became the lead designer at id Software.
Doom 3
Early in "Doom 3"s development, Trent Reznor of the band Nine Inch Nails, a fan of the "Doom" games, was set to compose the music and sound effects to "Doom 3". However, due to "time, money and bad management", none of Trent Reznor's sound effects or music made the final product. Eventually, Nine Inch Nails' former drummer, Chris Vrenna, produced and fellow Tweaker band member Clint Walsh composed the game's theme song.