Considering Guitar Hero: On Tour's required accessory, pirates without access to the Guitar Grip shouldn't be able to play the game, right? Incorrect! As they did with the Nintendo DS Browser and its Memory Expansion Pak, hackers have developed a workaround making the game playable even without the extra hardware.
If you skip to the 1:30 minute mark in the above clip, you'll see Youtube user tinymonkeyt demonstrating his patched copy of On Tour -- instead of using the four-fret controller to hit notes, you can use the directional pad or ABXY buttons. Of course, it's possible for people who legally own the game to apply the patch enabling button controls, but it looks much more awkward than using the Guitar Grip.
In other related news, according to the video, tinymonkeyt's mom isn't letting him buy Guitar Hero: On Tour. He is considering purchasing it anyway, however, and will probably "just hide it from her or something." We'll make sure to update you on any new information that comes up for this developing story.
Gallery: Guitar Hero: On Tour