Mark van Tongeren defended his thesis Grenzen van het hoorbare; over de meerstemmigheid van het lichaam.
In our culture, vocal harmonics are used as independent musical elements since only a few decades. Grenzen van het hoorbare explores the changing relationship between singers, listeners and harmonics.
As a research method a series of compositions (Nulpunten) has been developed, which attempt to make a fresh approach to overtone singing and to the sonic source material of the human body. They spark off a further investigation of reality and illusion of our auditory world. Using his experiences with Tibetan monks and Sardinian brotherhoods, and the ‘transverbal’ oeuvre of Michael Vetter, Mark van Tongeren develops his notion ‘multiphony of the body’. The last word, according to him, must be given to readers/listeners, who are challenged to shift their thresholds of the audible with the cd It starts here and the performance Incognito ergo sum.