Comfort is good as far as it goes, but I personally don't want "comfort" in church music -- I want something that takes me out of myself. A Talis canon, properly done, is truly awe-inspiring. Our choirs have done some anthems that have brought me to tears.
One of the Godliest moments of my life was when our kids' choir performed selections from Mendelsohn's Elijah. And on that note: having seen a group of 2nd-6th graders put those very difficult pieces together from scratch in a week of choir camp, and still be singing it from memory months later, makes me want to injure those kid choir directors who waste the kids' talents on insipid crap. Our choir director has found that the higher he raises the bar, the better the kids like it. (He's exceptional, obviously....)
Some guitar band repeating the same phrase over and over cannot compare. Then again, the composers can't compare to the masters, either....
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.)