Real Jewish Music is not what we call today “Jewish Music” real jewish music is Klezmer, which is hardly played today, there are a few non-relgious jews who keep klezmer alive but for the most part its dead.
Klezer uses certain instruments (I think like the Saxaphone)
If you arent sure what Klezmer is, Hava Negiliah is a Klezmer song (No its not relgious and wasnt meant to be, but at the time all jewish music sounded that way)