At 78, “Shakey” is showing no signs of slowing down, although he seems more comfortable with looking back. Recorded over the course of four shows on his recent Coastal Tour, Before and After is a live album with a difference: 13 songs from throughout Young’s career are performed, without audience noise, in a continuous 48-minute sequence. The acoustic-based selections cover seven decades and are mostly lesser known, although the minimal instrumentation and similar themes, such as the passage of time and a changing world, mean they complement each other well.