Don’t worry, it’s easier than it looks!



Use the stones to build an ascending scale. (Make the sounds go higher) That Easy :)

In case you don't want to try it yourself, here is the answer: 1-3-5-2-4
EDIT: This might have been right for me, but the correct answer is different for everyone.
So, you need to find the correct ascending scale for yourself. But at least now you know how to solve the riddle. :)

I've used the spoiler function in case you came across this guide but would prefer not to spoil the riddle for yourself.