The above image is from using the tutorial mentioned Here and the video link to understand what instance variables are here.
The reason I did this was because, the music was getting mixed up together and it seemed better to have a music track over a music randomiser.
To get the cast to available I needed to create a Game Instance variable blueprint, this is because, it is used as a container and has the property to stay on the map.
Summary
I am happy that I have fixed this and I am happy that it is easy to extend or shorten the track. I did wish the previous tutorial explained Instance variables though.
Game Growth 