I simply mean that the musician believes in what he has been taught - just as the Polish lancers charged the German tanks because they believed in the weapons they had been trained with. (Even if some say that story's apocryphal, it still makes a point.)
I am trained in the old English high church tradition, with all that implies - clear tone, no vibrato, crisp attacks and cutoffs on the vocal production side, and Renaissance polyphonic music with its distinctive harmonies and moving tones. So that music sounds most "correct" to me for a high Mass.
Kids can sing much better than they're given credit for. (Small brag - my mom's a music professor at a local college, and she made a tape recording of my THREE year old daughter singing part of the Queen of the Night's aria "O zittre nicht . .. " which she played for her class just to prove that kids could sing. Daughter is 16 and a mezzo now.)
It's good to hear of your experiences in Christian music. I have a very wide scope of taste when in comes to music, and I do not expect everyone to be that way. Perhaps if I get wiser with age, my tastes will change in kind.
Just for my own information, could folks here state examples of music or bands that they consider to be to repetitive or annoying. I'd like to avoid choosing those songs!