In the week of World Aids Day, two Edinburgh women tell Sally Magnusson about a new partnership with Zambia to overcome the scourge of Aids, which affects 30 percent of the population there. Music from the award winning Dunedin Consort and the Edinburgh Singers. Hymns sung in Edinburgh's historic Greyfriars Church include Marching in the Light of God, For All the Saints and Tell Out My Soul.