asson Natan knows about wake up calls. You see, that's how the chazzan of the Sephardic Community of Metropol- itan Detroit sees the High Holidays. That's how he gets ready for this time of year. When there are High Holidays, there are memories for some that the rest of us can only imagine. At age 5, he remembers his grandfather, Yosef Natan, who had made aliyah from Baghdad, banging on the doors of his Jerusalem neighborhood long be- fore the sun would rise, an- nouncing pre-Rosh Hashanah Selichot services. It is something Mr. Natan, now a Southfield res- ident, will never forget. Nor will he forget the many times he sat on the bimah with both his grandfather and his fa- ther, Yehezkel Natan, also a can- tor. Or the time he was alone on that bimah, at age 14. It was 1973, the Yom Kippur War. Dur- ing morning services, Yehezkel Natan had to leave to defend Israel. That af- Sasson Natan: ternoon, for Mincha Learning the services, Sasson Natan prayers as returned to a shul in songs. need of a leader. With the knowledge and strength he gained from years of watching his father and grandfather, Sasson Natan led his first Yom Kippur service. He hasn't looked back. Mr. Natan, who also is the lo- cal Sephardic community's spiri- tual leader, starts thinking about the High Holidays as soon as Passover is complete. When a per- son thinks of Passover, he says, one thinks of cleaning out spiri- tual chometz. Six months later, he says, we rename chometz: sins. During the month before Rosh Hashanah, Mr. Natan goes through the holiday preparations, listening to tapes and studying the work he has in front of him. It's the work for God that moti- vates him. It's an opportunity to get his congregation to take these holidays seriously, an opportuni- ty for self-examination and growth. "Our services are different than most," he said on a hot and sun- ny Labor Day weekend, when 65