The American musician Steve Gunn first heard of Sachiko Kanenobu a few years ago, when, at the advice of friends, he listened to her debut album “Misora,” recorded in Tokyo in 1972. Gunn, 41, is best known for his neo-folk guitar playing (and as a former member of Kurt Vile’s backing band, the Violators) and has more recently moved into producing albums for like-minded artists. He was instantly ta