Tinkerer, trickster, raver, wry experimentalist: Aphex Twin (Richard D. James, a.k.a. AFX, Polygon Window, Gak, and more) isn't just one of electronic music's most audaciously inventive and entertaining producers—he's practically a genre unto himself. With early cuts like “Pulsewidth,” he turned techno airy and billowing; mid-‘90s tracks like “Flim” and “Girl / Boy” took IDM to sentimental new heights even as they gave the world some seriously dizzying drum programming. Beatless tunes like “#3” and “Avril 14th” remain bellwethers for ambient music's expressive potential.