OK, I bought this on a whim today because I like crazy things every once in a while.
It turns out, this game is awesome. Not only is it completely insane (in the best possible way, I was almost laughing too hard to play at some points), but the gameplay is great and addictive. The song choice is a little confusing, but that doesn't prevent the game from being a ton of fun. I played it for two hours but barely noticed the time going by at all. If you have a DS, you NEED this game. You need it so bad.
You've always wanted to help a dog travel 400 miles to Deep Purple's 'Highway Star', you've just never known until now.