Richard D. James, an electronic musician from Britain, is renowned for his lively yet mysterious dance music and his reclusive trickster persona. Since the early 1990s, he has made music under monikers like Aphex Twin, AFX and Caustic Window; the frenetic new “Syro” (Warp) is his first studio album as Aphex Twin in 13 years. With cryptic song titles like “minipops 67 (source field mix)” and “s950tx16wasr10 (earth portal mix),” “Syro” suggests that Mr. James remains his playful self. Here, I chart “Syro” and 41 of his other known solo releases. There may be even more.