We’re loving Fractal Guitar, the new solo album by Stephan Thelen, the dazzling guitarist for prog group Sonar. Fractal guitar, if you’re wondering, is a system of delays and feedback Thelen devised so as to produce uncanny rhythmic patterns and atmospheres with his guitar. He invited a handful of great drummers and guitarists—including Henry Kaiser and Big Ears 2019 performer David Torn—to join him for these sprawling pieces. On “Urban Nightscape,” Torn, Thelen, and Markus Reuter gild a relentless rhythm section in diamonds and shadow, an interplay of darkness and light suggesting a sinister sense of possibility. Though the record isn’t out until late January, you can hear it now at Bandcamp. Listen for Torn on the first and last tracks.