They are among the most underprivileged children in Lebanon, and now their voices can soar. For several months, conductor and composer Salim Sahab auditioned youngsters, most of whom work, for a choir of 300. With Syrian and Palestinian refugees selected along with Lebanese children, hopes are that the unifying power of singing will help cross political and sectarian lines. Having performed the same feat in Egypt, Sahab plans to get them on the big stage. John Owens reports from Tripoli.