Breaking wp_list_pages over multiple columns

I’m wondering if anyone can help me with this problem.

I’m using wp_list_pages to display four columns of navigation at the top of my page. The two columns on the left contain the child pages of a parent page called “Music”, and the two columns on the right contain the child pages of a parent called “sound”. Up until now I’ve been trying to hack a solution out of using the number= and offset= arguments belonging to the wp_list_pages tag. For example, the first column of music is set to number=6 while the second column of music is set to offset=6, for a total of 12 visible nav items.

The problem with this is method is twofold: 1) I have to manually re-jig the code every time new child pages are added and 2) the offset function isn’t working.

I came across this thread that discusses automatically breaking a categories list over two columns: http://wordpress.org/support/topic/227180?replies=33

This would be the ideal solution for my list_pages problem. Can anyone advise me on if this is possible or better yet point me in the direction of how it might be coded?

Thanks