"They come to eat" is a great video, but I think Carlton's bear call leaves something to be desired.
I have a couple new "secret calls" (lol) that I like to use, and as for call makers on this site, Bearmanrick makes some good distress calls and Arkyyoters Screamin Demon helped pull in a bear for me last August.
Pomoxis hit most of the big points, but I would reccommend calling for the whole hour / hour & half if you are cold calling. Bears can lose interest real quick.
Navy_Gunner also hit the main reasons why I love to call bears. The teeth poppin / slobber drippin / brush breakin is quite a rush.