Is singing the MOST important aspect of auditions?
Are you a junior? If so, and you wish to pursue MT, do whatever you can now to get private voice lessons. Most who apply to BFA in MT programs are training in voice and you will be at a disadvantage. In my view, with MT, those who stand the greatest chance of admission are very good at singing, acting, and dancing. It is so competitive that they can find students who are strong in all three skill sets. HOWEVER, it is still quite possible to be admitted if strong in two areas and you have potential in a third area. For instance, someone who is strong at singing and dancing but weaker at acting may have a shot. Someone who is strong at singing and acting but weaker at dance may have a shot. There are even some schools that do not have a dance audition in fact. But the one area where I feel one can’t be weak and merely show potential is voice. So, I don’t know that much about you but I would do 3 things. I would train in voice as much as you can and apply to some MT programs, possibly the