Chords for Pal | Feat. Arijit Singh | Nawazuddin Siddiqui | Monsoon Shootout | Rochak Kohli | Vijay Varma (). 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.