I learned about Horseback—otherwise known as Jenks Miller of Chapel Hill, North Carolina, and assorted collaborators—thanks to the arid, pitch-black, mesmerizing LP The Invisible Mountain, released in 2009 on Milwaukee’s Utech label. Today’s 12 O’Clock Track is the A side of a Horseback seven-inch due in early April on Brutal Panda, and like my favorite songs from Miller and company, it’s a hypnotizing high-desert bad trip.