I really enjoyed Gregory Ellsmore's setting of this song with piano, but here is a different one for unaccompanied voices. Because it was written for an octet which actually had three real sopranos and one real alto, the first alto part is really a 3rd soprano, and goes up to a top G. Alternatively, you can divide the sopranos into 3 at letter F and have all the altos on the remaining alto part at that point. I had tremendous fun with the end section: I just can't quite get Sibelius to play the final glissando the way I know the voices will sing it!