Guitar Hero is a popular series of music video games published by RedOctane and Activision. The series is notable for its use of a guitar-shaped peripheral to simulate the playing of rock music, represented on-screen by colored notes that correspond to fret buttons on the controller. The games support both individual play, as well as cooperative and competitive modes for two players. The series has used a range of both licensed and independent rock music tracks from the 1960s to present, several of which are master tracks from the bands. In total, four games have been released for video game consoles, while one game has been released for mobile phones.
The series was developed by Harmonix Music Systems from 2005 to 2007 before development duties of the series were transferred to Neversoft, whose first effort, Guitar Hero III: Legends of Rock was released in October 2007.
The Guitar Hero franchise has become a cultural phenomenon, making many appearances in popular culture, and the games have become extremely popular as party games. The series has sold over 14 million games, earning over US$1 billion.