Tower of Fantasy has tons of small puzzles around the map, including these peculiar stumps in Ring of Echos that play music notes when you step on them. As indicated by the minimap, this is an exploration puzzle, so there’s loot to be earned if you step on them in the right order.
Our Tower of Fantasy puzzle guide explains how to solve the music note puzzle in Ring of Echos.
To figure out which stumps to step on and in which order, you just have to get the first one correct and the rest will glow in order you need to step on them. This is the first one to step on, near some berry bushes:
Once you do that, another stump will begin to glow, prompting you to step on that one next. The stumps look like this when glowing:
After you step on all of the stumps in the correct order, a chest will appear, rewarding you with a Gold Nucelus.