Usopp didn't recognize the song at all, but it was good, and Brook's voice echoed really nicely in the night, over the sound of the wind and Usopp's own stumbling efforts to proceed. By the time the song had finished, Usopp had started wrapping the bedsheet 'cape' closer around his body, trying to keep himself from shivering in the sleeveless coveralls.

Instead of commenting on the music, when Brook went quiet, Usopp asked, "Brook... does it feel like it's getting colder to you?" Maybe it was just his imagination, or more time exposed to the cold. Wasn't a bigger body like Brook's more vulnerable to it, probably? Maybe not...

Well, whenever the night ended, they'd wake up safe and warm in their beds anyway. They just had to keep moving in the meantime. Compared to their time on Drum, this was nothing! True, he'd worn a coat there, and had a vague memory of flowers and Vivi and a swollen face, but all of that had probably just been his overactive imagination.