Chords for O Saathi Video Song | Baaghi 2 | Tiger Shroff | Disha Patani | Arko | Ahmed Khan | Sajid Nadiadwala (). 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.