Moshe Aaron (Morris Arthur) Yess was an Orthodox Jewish musician, composer and entertainer from Montreal, Canada. A member of the Chabad community in Montreal, Yess was a regular performer at Chabad House events and shows, together with general music festivals and the annual A Time for Music concert.
In the 1960s, Yess shared stages with David Crosby, Jefferson Airplane & The Association. As a solo performer he played Las Vegas, Reno, and other hot spots. In 1978 he moved from Hollywood, California to Jerusalem, Israel, where he enrolled in D'var Yerushalayim Yeshiva. There he met Rabbi Shalom Levine, who became his mentor in Halacha and his musical partner in Megama. They spoke about harnessing American-style music to communicate the beauty and values of Judaism. Thus was Megama (Hebrew for "direction") born.
One of Yess's biggest hit songs was "My Zaidy," in which the speaker remembers his grandfather, who was his last link to Judaism. "My Zaidy" -- "zaidy" is the Yiddish word for grandpa -- touched several generations of American and Canadian Jews. Other hits by Megama included "Ain't Gonna Work on Saturday" and "Not Ashamed," and one of their successful children's shows was called "Judeo Rodeo."