for free?
http://4-ch.net/music/kareha.pl/1105320936
Also, Nachum Segal has a show on WFMU, Monday to Friday from 6Am-9AM (archives on wfmu.org): http://www.jmintheam.org/
He plays a lot of different Jewish music. I even catched him playing some metal once but it was quickly superseded by yet another ultrasweet, emphatic pop song.
by using the right search terms.
styles like nigunim(music without words), traditionally used instruments; such as shofar (the ram's horn played ceremonially); composer names like salamone rossi (ren. composer of hebrew motets), and so forth.
("jewish religious music" is really a pretty vast and wide term...)
throught kazaa
search:"jewish"
You might find the following about Kazaa's court-case interesting. Particularly the third section:
http://www.apcmag.com/apc/v3.nsf/0/07A1C8CA269E79B5CA256FA1000F9763