Everything Truewarrior said
Also the head singer must be able to able to keep his anger and emotions in check unless something outrageous has happened concernign the drum.
1)They must be able get along with EVERYONE! whether they like the person or not.
2)Its the head singers responsibilty to carry that drum and protect its spirit or spirits
3)Know the songs, origins, who wrote it(if possible) everything about the songs that are sung. You never know when you might get called on it.
4)Sometimes, if not the drum keeper, the head singer has the responsibility of "feeding" the drum..nuf said on that
5)Head singer is the mediator between the drum/singers and everyone not with the drum. Be abel to handle that with, tact, poise, and respect.
Cant think of anything else for now, too early and I havent had my coffee yet