"18 Days" is the second single by American rock band Saving Abel from their self-titled debut album.
 It was released after the band's hit single "Addicted".
 "18 Days" reached #10 on the "Billboard" Hot Modern Rock Tracks chart and number six on the Hot Mainstream Rock Tracks chart.
 The song is also featured in Tapulous' hit iPhone OS games "Tap Tap Revenge" and "Tap Tap Revenge 2".
Venan Entertainment, Inc. is a mobile and handheld game development studio based in Middletown, Connecticut.
 Founded in 2002, Venan began primarily as a Java/Brew-based mobile phone game developer, but has since branched off to develop games for Nintendo DS, iPod, and iPhone OS.
 Venan's most recent titles include their fifth fully independent, self-published title Book of Heroes, and the TouchArcade and EGM Game of the Year .
 Both are available for the iOS devices.
 Other recent Venan-developed titles include Ninjatown for the Nintendo DS, Monopoly Worldwide and Monopoly Classic for the iPhone and iPod Touch, and NBA Live for the iPhone and iPod Touch.
Tap Tap Revenge, also known as Tap Tap Revenge Classic was a music game created by Nate True, and developed and published by Tapulous for the iOS in July 2008.
 It is the first game in Tapulous' "Tap Tap" series.
 Development for the game began prior to the release of the iPhone SDK, and was originally entitled "Tap Tap Revolution".
 The goal of the game is to tap each of the colored balls when they reach a line at the bottom of the screen.
 If the ball is hit on the beat, the player gains points, but if not, it counts as a miss.
 There are also "shakes", which require the player to move the iPhone, iPod Touch or iPad (although the game was designed for the former two) to the right, left, or middle.
iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware.
 It is the operating system that presently powers many of the company's mobile devices, including the iPhone, iPad, and iPod Touch.
 It is the second most popular mobile operating system globally after Android.
Otto Matic is a 2001 action-adventure video game developed by Pangea Software and published by Aspyr Media for Mac OS 8,Mac OS 9 and Mac OS X.
 It came bundled with iMac G3 and G4 computers.
 The game was later ported by Ideas From the Deep to Microsoft Windows in 2004.
 An iPhone OS port, titled "Otto Matic: Alien Invasion", was released by Pangea in 2009.
Maestro!
 Jump In Music is a rhythm action game for the Nintendo DS and iPhone OS.
 It is published by BigBen Interactive and developed by Pastagames and Neko Entertainment.
 The game was released for the Nintendo DS in Europe on November 6, 2009.
 The first world of the original retail title was released as a standalone app titled "Maestro!
 Green Groove" for iPhone OS on March 6, 2010 and on DSiWare on June 28, 2010.
The iPhone Dev Team is a group of engineers in the iOS (formerly "iPhone OS") community which has developed several tools to enable use of applications not authorized by Apple Inc on the iPhone, iPod Touch and iPad, and to enable use of the iPhone on GSM carriers not contracted by Apple.
 These applications provide owners with the ability to sidestep the limitations placed on the devices by the manufacturer, allowing for activities such as deep customization and easy international roaming.
 The group and their tools have become emblematic for these activities, which are termed jailbreaking and SIM unlocking respectively, to the extent that the Electronic Frontier Foundation have made them the primary example used in their petition to create a DMCA anti-circumvention exemption for jailbreaking and Apple executive Greg Joswiak (Vice President iPhone Product Marketing) has quoted them in his countering comment to the same petition.
Wild West Guns is a WiiWare and iPhone OS shooting video game by Gameloft.
 For the Wii, it was released on August 1, 2008 in Europe, on August 4, 2008 in North America, and on August 5, 2008 in Japan.
 It costs 1000 Wii Points.
 On February 5, 2009, Gameloft released the game worldwide for the iPhone OS via the App Store.
 It costs $4.99 USD.
"Two Weeks" is a song by American metal band All That Remains.
 The song was released as a single from their fourth album, "Overcome", on September 18, 2008, and a music video was released to television on October 4, 2008.
 In the U.S., it peaked at number nine on the Mainstream Rock Tracks chart and at number 38 on the Modern Rock Tracks chart.
 The song was featured as a free playable download on the popular iPhone OS game, "Tap Tap Revenge 2".
 It was also released as DLC (downloadable content) in the Rock Band series, along with "This Calling" and "Chiron".
Installer X is a package manager for iPhone OS 2 up to iOS 6 designed for legacy jailbroken iPhone, iPod Touch and iPad devices.
 Installer X is based on Installer 4, originally created by Ripdev, which allowed users to browse and download applications from a range of sources when the AppStore and Cydia hadn't been introduced yet.
 Installer X uses a different packaging system from Cydia's APT, and as a result, Installer X is faster than Cydia.
 Installer X is specifically designed for legacy Apple devices, with the legacy hardware in mind.
 Because of that, Installer X is a fully featured

Question: 18 Days is a single that was also used in the iPhone OS game that had music created by whom?
Answer: Nate True