Help! Any recommended cermony vocalists?

Help! I was supposed to have 2 singers for my wedding ceremony and I just receievd an e mail and they can not do it anymore b/c of an 'unforeseen' family crisis.....Well I really need to find someone for the ceremony. They were supposed to sing and also play the keyboard and guitar. As of now I have the organist that comes whith th church fee, which I was not going to have originally, and I need a singer! Any help would be greatly appreciated!!!

Thanks!