The sparks in the video represent the staccato song while the violin represents the violin in the legato song. The left panel on the bottom slides slowly to the violin while pitch is shown on the other violin panels. I also chose to make the smallest spark panel the one with the most energy to match the staccato beat that has higher frequency.
I worked on this for about 7 hours on the pictures and about 20 minutes to pick a song and a part I would crop.