Stress

 
You should probably leave your musical performances at home... (Source)

Exciting? Occasionally. Stressful? Definitely. You're working for musicians, a class of people hardly known for their ability to function like normal human beings. So expect some very stressful, fifteen-minutes-until-show-time-where-is-Jenny?-type crises. And worst of all, you aren't able to convert those stresses into soulful, chart-topping singles—you just have to hope the frontman can do that.