Help with modifying random background music player

I’m wanting to create a music box with enough tracks that the listener won’t get bored. I’ve found a code that will work. I just need to know how I need to modify the code to reflect the total number of tracks.

[CODE]var x=Math.round(Math.random()*9)[/CODE]

That’s the line I need to fix. That goes to the player that’s set to play 10 tracks. I have 55 tracks. What do I change the *9 to?

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