Oehrle, Elizabeth Dittmar.Laidlaw, Petronella.2013-02-222013-02-2219881988http://hdl.handle.net/10413/8572Thesis (M.Mus.)-University of Natal, Durban, 1988.No abstract available.en-ZAChoral singing--Instruction and study.Voice.Theses--Music.The principles of voice production in choral singing : a guide to conductors.Thesis