I'm auditioning for an a capella group next Wednesday. For our audition, we have to sing about a minute of a song without music, any suggestions? I was thinking of doing Ashes and Wine by A Fine Frenzy, but I wasn't sure.

That is a lovely choice. I think it would give you a chance to showshowcase an upper register. With that being said if you aren't confident with a high key or you simply want to show that you have more of a rang. I suggest 'jar of hearts' or 'bluebird' by Christina Perry. These songs have the same feel but I think a bit more dynamics.