Every year, music stars have another opportunity to get themselves onto fans' mp3 players with a new crop of music: holiday tunes. This year was no different, with some artists offering up full albums, EPs and singles. In the following pages, we break down some of these new tracks, from Leighton Meester, Darius Rucker, 3 Doors Down, A Fine Frenzy, Lady GaGa, Neil Diamond, Spongebob Squarepants, Pet Shop Boys and a Band-Aid-like indie rock supergroup.

Click here to check out our picks for best new Christmas albums of 2009, including David Archuleta and Bob Dylan.

Click here to check out the cast from "Glee" sing "Last Christmas, which is one of the best from this year, too.

Now for one of the worst: Lady GaGa's "Christmas Tree" is just so stupendously stupid and awful, the most terrible Christmas song ever in the whole wide world ever. And we are just so, so glad that it exists, and that it was Lady GaGa who did it. Her Christmas tree is her lady parts, get it? Spreading Christmas cheer. Put her on top. Fa lalalala la lala *ungh*.

This would be an "Saturday Night Live" digital short if it had some Andy Samberg, a pair of five-inch heels made of gingerbread and a tube of snow-white frosting. "My Humps" looks like a sledding hill compared to this black diamond.