Well, as Terry demonstrated, our biggest worries in the bush aren't bears, just some of the other campers.
One other thing worth mentioning-- is just making a fair bit of noise when hiking. This bothers our wilderness sensitivities, but is the standard recommendation for hikers. Singing, clapping hands, shouting, &c. The main purpose is to avoid surprising a bear, which can easily happen in heavy brush.
We found that the "Day-Oh" call from the Banana Boat Song Harry Belafonte - Banana Boat Song Lyrics | MetroLyrics
is about the easiest one to maintain with a loud voice when slogging up a trail. Bear-related songs, if not heard completely by other members of your party, might lead them to conclude falsely that one was spotted at close range.
Famous Last Words: "I wonder where the mother bear is."