What is the most popular Hanukkah song? It's probably "I Have a Little Dreidel," which even a lot of gentiles learn as children. It tends to be the token Jewish song sung in elementary schools during the holiday season, which, of course, is dominated by Christian themes.
But like a lot of Christmas songs, the lyrics of "I Have a Little Dreidel" don't have a direct connection to the religious holiday with which the song is associated. They are simply about the four-sided top used in a game that is played during Hanukkah, an eight-day festival known as the Festival of Lights that begins at sundown on Dec. 21 this year and commemorates the 2nd-century B.C. rededication of the Temple in Jerusalem following its desecration.
In other words, it's a children's song, thus reinforcing the notion that Hanukkah, which is not the most important religious holiday on the Jewish calendar, was boosted by reformed Jews in the West because they were worried their kids would feel left out of the whole Christmas thing. "Oh Hanukkah" is another holiday song that's sometimes taught to children because, like "Dreidel," it's got a frisky rhythm and playful lyrics. After that, most non-Jewish people's knowledge of Hanukkah music ends.