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| == Introduction ==
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| Dance Dance Revolution (DDR) is a rhythm-based video game. Players perform steps on a dance platform in synchronization with music as directed by on-screen step charts. The dance pad contains up, down, left, and right arrows, each of which can be in one of four states: on, off, hold, or release. There are $4^4 = 256$ possible step combinations at any instant since the four arrows can be in any of the four states independently.
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| [[File:Figure1.png|thumb|200px|center]]
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| Step charts exhibit complex semantics and tend to mirror musical structure: particular sequences of steps correspond to different motifs and reoccur as sections of the song are repeated. The DDR community uses simulators, such as the opensource StepMania, which allow fans to create their own charts. Typically, for each song, packs containing one chart for five difficulty levels are craeted.
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| While players may grow tired of existing charts in standardized packs or creating charts can be really time-consuming for players, the authors introduce the task of learning to choreograph, which learns to produce new step charts given raw audio tracks.
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