She was standing straight, but relaxed, peds together, hands at her sides, head slightly lowered.

She brought her arm up in front of her, reaching with her hand, and the speaker behind her made a swooping sound up the scale, breaking into a chord as her fingers closed on the invisible tone in the air. She bent her knee forward and a soft bass note crept in, strengthening as she tensed the muscles in her thighs. She added more harmonics with her other hand, then abruptly cocked her body to one side, exploding the sound into a cascade of chords.

[…]

She was lost in a world that existed slightly out of phase with the real one, a world where dance was music and her body was the instrument. Her eyeblinks became staccato punctuating phrases and her breathing provided a solid rhythmic base for the nets of sound her arms and legs and fingers were weaving.