so what music will accompany the royal bride, cate, on her big day? our cnn s max foster got to listen in on the rehearsals. reporter: the service at west m minister abby will have music as regal as the occasion. their outfit is the oldest in the british army and they take their place in british history once again for the royal wedding. once she s inside the church, catherine will come through the choir screen there with her father, past the choir stalls where the choir will be standing. we expect her to come up here to the high altar where she ll meet william and be married.