Chords for Aoki Hagane no Arpeggio: Ars Nova OP - SAVIOR OF SONG (Guitar Cover) (). Spark is the smartest and most interesting app to learn and enjoy playing guitar. Spark is an all-around app for beginners and advanced players to learn any song with chords or master new skills with hundreds of lessons and games in Spark.Spark Chords|Aoki Hagane no Arpeggio: Ars Nova OP - SAVIOR OF SONG (Guitar Cover)