First you need to take note of where the vertical line (vline) is.
Since horizontal line (hline) is not moving at all.
So the code will go into play.
How long the song takes has to be taken into concern because you need to know when to actually stop the vline.
In the stop button, when the music stops, the vline will go back to its original place.
The code should go in the PLAY button...right where the music starts...or your CD Player is going to be way off. Good luck!