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Ah, but not only a good song. It has to be a song that matches the rhythm of the skiing. So if you're doing high numbers of rotations and switch ups, and faster song is required. If you're skiing pow, or smaller numbers of rotations, a slower song.
For example, Kid Cudi' Pursuit of Happiness would sound ridiculous over really aggressive skiing. Similarly, a fast hip hop track would not fit a pow shoot.