For Halloween, J.S. Bach’s Toccata and Fugue in D minor, BWV 565, or, as The Washington Post’s Alexandra Petri more engagingly calls it, “The Bach Song That Goes DEEDLE-EEEEEE … Na-Na-Na-Na Naaaaaaaaaah Na.” An ominously playful performance by Ton Koopman, playing the Rudolf Garrels organ (1730-32) of the Groote Kerk (Great Church) of Maassulus in The Netherlands: