Klezmer is best recognized as the dance music played at traditional Jewish weddings. There is a really great wikipedia article about it here with very specific information about the genre, it's history, types of songs, tempo, song structure, musical keys and the instruments traditionally used to play it.
This will be a very interesting month of songs but I really look forward to it. As Danny Imig points out:
"It's a weird genre but it's like Jewish wedding music, and, to my ear, sounds gypsy, Greek, Mariachi, or even Ska."The style really has a lot in common with most eastern European music and is pretty open ended from there. Good luck everyone!