Different music options in one scene depending on conditions

Hello all. I have a singleton method MusicChange script which I have used in the past to keep music playing throughout until there is a call on scene to change it. This is the first time I am using the script to have numerous possible tracks in one scene.

In the game, players can choose between modes "Timed" and "Lives" and then "Easy", "Medium", or "Hard." With this, I have 6 possible tracks to play on the scene based on all possible combinations (Timed/Easy, Lives/Medium, etc).

I am using a long if-statement to determine which track will play in the gameplay Scene. It successfully plays the track I want depending on conditions, but will not loop when this script normally automatically loops my music until a new track is called. Anyone have any ideas why this would be? Thanks very much.