Chords for 【女性が歌う】Butter-Fly / 和田光司『デジモンアドベンチャー』OP（Covered by コバソロ & 七穂） (). 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.