Those who see Guitar Hero 5 as the fifth instalment of the seminal rhythm-action series are sorely mistaken: the grand total of titles brandishing the name, including full games, expansions, portable versions and future titles, exceeds the ten mark. In other genres, when a game series reaches such a milestone, it's usually a cause for celebration. What these titles tend to do, though, is change, adapt and evolve over the years, remaining relevant to contemporary audiences. Guitar Hero has more or less retained the same gameplay year in, year out. Is yet another incarnation really necessary?