Pages and Sub Pages

I’m doing a site for a friend who’s a professional musician.
I’m currently stuck on the pages list.
One page on the list is ‘Discography’ and its subpages will be ‘as a producer’ and ‘as a musician’.

The problem I’m having is that the subpages are showing on the page list in the ‘header’ part. How do I exclude the sub pages from showing in the list? I’ve tried the following code:

<ul>
<?php
wp_list_pages('exclude=14,15' ); ?>
</ul>

It removed the subpages but it also messed up the page list from showing properly.