I hope that was sarcasm Tutorial Doctor. Fiver is a joke, or it's not the best option, at the very least.
Even if you get a ton of customers, the amount of work versus pay for each job is ridiculously low and not sustainable. At least, not in my opinion. Perhaps Fiver can work with some parameters and I've seen a few users post some. Like, for example, first 30 second theme is $5 and any additional work after that is at a standard rate.
But the first thing I think when I see someone posting "I'll compose your whole soundtrack for $5" is how good would it even be?! How willing would they be to work with me and do revisions to ensure they fit my vision? Just like with other purchases (computers, cars, food, etc) having too low of a price point can actually backfire.
Edit: This headline made me laugh however: (terrible actor though )