Well actually, I think they can. But I think it is only possible after immersing themselves in BM and only if she/he has a good ear. By immersing themselves in BM I mean extensive listening and also extensive practising with a teacher or established chanter that also has a good ear.
Perhaps equally important as the question of whether or not a western trained singer can chant the microtones is if a western trained singer can actually achieve the vocal techniques chanters employ so as to produce a more authentic sound and performance practice. This in some respects may be harder than getting the pitches right.
I have heard recordings of western musicians singing BM and what strikes my ear as being unauthentic is the performance practice. Much like when an established and competent chanter attempts to sing secular music (like an amane for example). While the pitches and other technical musical elements may be "correct", to someone with knowledge of the style the performance may not actually sound like an amane because of the vastly different tecniques employed in the performace practice of the two styles of music.
Here is something written on the topic by a performer of both western music and BM
“Byzantine chant involves moving the larynx in a way that is not customary for Western singers,” says Boyer. “This style of singing produces a slightly nasal tone, somewhat like a drone, with a full, round vibrato. It shouldn’t be a thin nasal voice, but a richer tone with a lot of space behind it. It’s a vocal technique that allows for flexibility to sing in the cracks, microtonal intervals or ornaments that you can achieve by moving the larynx. It also allows you to sing for long periods of time without tiring, and that helps with Greek Orthodox services, which often last a long time.”
it was taken from this article:
http://grhomeboy.wordpress.com/2006/07/27/john-boyer-sings-byzantine-chant/
I think I have also read something regarding the differences in vocal technique between western music and BM on the stanthonysmonastery web site - it may have been something in the links section. I will look for it later.
Has anyone else got info re this topic? What are other's opinions on this? We have some members who have come to BM after first being trained in western music. What is your experience?
Kiriaki