Our “rules” are very relaxed to non-existent. d:o)
But if you are really trying to stick to the “theme”, the theme title can be anywhere in the song...ie, title and/or lyrics.
Just have fun.
The Robe ~ The Rescue of Demetrius
http://www.youtube.com/watch?v=8iuJqjhNSZE
Ah - the title can be anywhere - that does make it easier, and more fun.....