A friend would dearly love to find an old song she vaguely remembers from, she thinks, girl scouts.

She thinks it is some kind of classic poem, and she thinks it contains trees along a black river or water (i.e., at dusk, probably)

I know this sounds like the kind of refrerence question I used to get at the library, but am hoping it rings a bell qith someone.

usual sources already checked.

TIA, me