There is more than one band with Thirteen as their name:

1) Thirteen is a post-hardcore sounded band from Jakarta, Indonesia. they released their first album (It's All About Party Music And Friendship) in 2008, and get well-known after the album released. They call their fans as The Thirteen Army. http://www.myspace.com/thirteenjkt

2) A ndw band formed in the 80's.