Where can i get singing lessons?

Hi, I was wondering if there is anywhere I can get singing lessons? I wanted to start them before I left Australia, but unfortunately I was too late. I'm not the type of person who's into using free-lance teachers, I'd rather go to a place that teaches all sorts of music, including singing-lessons. Oh I'm 17 years old, so that probably plays a vital part in finding the right place. I'd really appreciate any help because a friend and I are auditioning for a couple of roles in a play later this year. Thank you.