Should I try out for the Gardner Community Theatre?

I just so happened to find a flyer in the shopping cart at Wal-Mart announcing try-outs for the Music Man with the Gardner Community Theatre. Try-outs are Saturday and Sunday, the performances are July 25th-27th. I'd really enjoy this. I haven't been a part of a musical performance (other than some lame voice recitals in college) since High School. It would be a lot of fun and it would be a great way to be in the community.
Anyone can make the chorus, but I'm considering trying out for a minor singing part. I'd have to sing a 15 second selection of music and I have no idea what I'd do. So, I'm not sure whether I should go for a part or not.