Guitar Hero On Tour: Decades (ギターヒーローオンツアーディケイズ, Gitāhīrō Ontsā Dikeizu) is a Nintendo DS game released in Europe in 2008. It is the second installment of the Guitar Hero series on the Nintendo DS platform, and the fourth entry in the series overall. The game features songs from the 1970s to the 2000s, and includes a variety of modes and features that make it an enjoyable and challenging experience for both novice and experienced players. Players can play either on the guitar or on the drums, and can choose from five difficulty levels. The game also includes a Career Mode, allowing players to progress through various stages and unlock new songs and characters. In addition, there is an Online Mode allowing players to compete against others from around the world. With its wide range of songs and features, Guitar Hero On Tour: Decades is an enjoyable and engaging way to experience the guitar-playing experience on the Nintendo DS.