Chords for 周杰倫 Jay Chou【等你下課 Waiting For You (with 楊瑞代 Gary)】歌詞版Lyrics MV (). 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.