Giving credit where it's due--this song is Hanerot Halalu, by Margie Rosenthal and Ilene Safyan (oops--see update)

Oops! When we asked Deborah Sacks Mintz, after the concert at the Hadar National Shabbaton, what she called this niggun, she told us that it was a Chanukah song and that she didn't write it. I found the original here.  [Feb. 2021 update:  I've since learned that this is considered a traditional tune--no one seems to know who wrote it.]