Hi there seems like we both got our basics from classical music, or choral singing !!!
My teacher is David Lim also runs schs to schs teaching choir. I join with him 6 years liao.
SAd now finish army wan to find him but he has retired...
Anyway i learn most of the basic during these choir sessions. the rest is ... depends on what u like.
TO TS: I don't believe so much in good teachers cos its always 30% teacher 70% self. In this case singing add in another 30% for talent. I believe one can be taught to sing nicely in maybe a kok hall with plenty ppl who would praise you, but in front of a judges n teachers on singing, that will be somehow hard. see whats your target as well...