Just look at it this way. If your band doesn't have the drive to go to meetings, how could they ever steal your songs and rehearse them again with another band? That would take too much effort. :rolleyes:
Besides, you could write down or record your songs and send them to yourself through registered mail. I'm not sure about the legalities of that in the music biz, but its a good way to make sure people know you wrote the song first.