What is the best way to synchronize a directory tree over USB, from a Windows XP computer to an unrooted Android phone?

I’m looking for something to perform like rsync does on Unix systems, that is, software that can update the directory tree on the remote host (Android) so it’s once again identical to that on the local host (Windows). I don’t mind doing this wirelessly but would prefer to do it over USB, and it’s mainly my music and photos trees that I am wanting to synchronize.