Chords for 1 Simple Trick for Smooth Chord Changes | Guitar Lesson | Steve Stine | Guitar Zoom (). 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|1 Simple Trick for Smooth Chord Changes | Guitar Lesson | Steve Stine | Guitar Zoom