The pursuit of success requires you to cultivate a commitment to consistency. In other words, you want to always be prepared to give your best performance – while you also have a plan in place to keep getting better.
Pitch is one of the fundamental, foundational core elements in singing – so much so that it is one of the most important – perhaps the most important – quality of a great voice.
Eat lightly the day before and the day of. No heavy foods like red meat or rich sauces. Eating light will improve your energy. Chicken, fish and tofu/beans are the best sources of protein that are easy to digest. Fresh juices (no orange juice) are great sources of energy.