I don't do the bell thingy, but I do sing while in bear country. Bears have pretty good sense of hearing so it doesn't need to be at any heavy metal or operatic volumes. Just enough to let the bear know you're coming and not startle them.
A couple of years back I was at Yellowstone and going from one area to the next along a lesser used path. I was with the Mrs. and was singing a little marching ditty as I walked along. Coming down the trail towards us was another couple who smiled and said, "I see you're having a pleasant day" I smiled and answered, "And if I sing enough to warn the bears that I'm coming, it'll stay that way." They chuckled and went on their way.... both began to sing, too.
I understand the safety issue as well as the LNT issue. I don't wear bright colors but do carry them for emergency purposes only. I don't play loud music, but I do sing at certain times. There can be a reasonable balance between Safety and LNT.