Musicians can bring any old instrument strings for recycling and get their electric or acoustic guitars restrung with D’Addario NYXL or Nickel Bronze Acoustic strings.     Old strings collected during the event will be recycled through Playback, D’Addario’s free, national recycling program. Playback is the world’s first instrument string recycling program, launched through a partnership between D’Addario and international recycling company TerraCycle.