Guitar Hero is outselling rival Rock Band 6:1, Activision boss Bobby Kotick has claimed.

Guitar Hero and Rock Band are seen as the two biggest games in the music genre, and have enjoyed incredible sales over recent years.

Speaking at the Goldman Sachs Communacopia XVII Conference, and reported by Kotaku, Kotick said Guitar Hero's immense success was down to its unprecedented access to world music and its sizeable development team.

He said: "We're outselling [Rock Band] 6:1. When you think about the access we have to 30% of the world's music at Universal, we have a unique advantage there. I would also say when you look at resources, you know, our next-nearest competitor has a couple of hundred people working on these projects, we have close to 2000 people just dedicated to the Guitar Hero note tracking, introduction of new hardware, introduction of new software, and so we just have a lot more in the way of resources available to us to continue to dominate the category."