Don't risk it, and just walk along the river

On second thought, those rocks look slippery, best not to take unnecessary risks. You walk up the river instead. The river seems to get narrower the further you go along, the riverbank rising a little, and trees grow tightly to the edge. There's a calm silence, and you can't help but sit down and absorb it all. But wait, what's this? You hear something faint, something not too far away. Is that... Singing? Your ears turn to the direction of its source. Yes it is indeed singing, and it's the most lovely humming you've ever heard. You're intrigued about it and go see who it is.

Just a few dozen metres away there's a small islet in the centre of the river, a lonely willow tree whose branches sway and gently touch the water. There's a figure, sitting in the shade, lying on her side, singing and humming melodiously while playing wit some grass. She doesn't seem to have noticed you yet.