Just have to say, black oil sunflower seeds are pretty much the only thing birds around here will eat. The only thing that eats the millet out of mixes are the house finches (they hog the feeder) and doves (not particularly interesting). Sunflower will bring in any of the woodpeckers, titmice, chickadees, gold finches, nuthatches, creepers, and cardinals.
Sunflower>*