If the piano compositions of Abdullah Ibrahim or Eric Satie perk up your ears, you'll be intrigued by the piano work of Emahoy Tsegué-Mariam Guebrù, an Ethiopian nun, pianist and composer who for nearly thirty years has lived cloistered in an Ethiopian Orthodox convent in Jerusalem. A series of concerts this week in Jerusalem highlight Guebrù's music, premiering pieces the 90-year-old composer first recorded on l.p. fifty years ago, in Ethiopia.