JEWISH MUSIC MASH-UP How often do you get the chance to see a concert featuring a rabbi and a Christian gospel choir? Sunday sees the kick-off for the fourth Netivot Shalom Music Festival. Previously an annual event, the festival now hosts five monthly Sunday concerts featuring local artists performing a diverse array of Jewish music. It is a grass-roots effort, organized totally by volunteers, say the organizers, and they favor concerts with a twist, hence the mash-up on Jan. 20 which includes Rabbi Menachem Creditor. March 17 includes a klezmer band and two jazz big bands; and April 14 features a Grammy-winning Boys Choir, a black Jew by Choice who sings Yiddish music, and a beautiful young opera singer. Congregation Netivot Shalom is on University Ave. For more details, visit their website.