The bolded text below, with a [#], is meant to highlight the 4 things that could be better.
Edit a populated Soundtracks page, select Correct/Delete for Soundtracks. On that page, the little blue "?" in the heading for the column "Order" goes to this page (in a new tab, that's good):
which does NOT mention Soundtracks credits. That's bad. 
Back on the Soundtracks contribution page, click on the link in this paragraph above the contribution fields:
"You can get help by clicking the blue buttons to the right of the form, or by taking a look at our Submission Guides."
and you get this page (ON TOP OF your Contribution screen, that's bad ) & (why not go directly to the Soundtracks guide?):
Within this table of contents for all submissions guides, search for Soundtracks, click & get this page:
Search for Order and find this on the bottom of the page.
Ordering: The ordering for Soundtrack items should reflect the appearance of the song name in the end credits. If a song name is not mentioned at all in the end credits then it should have an order number of 0 i.e. zero.
Why not just link the little blue "?" for Order (where I started) to the above paragraph on this page? Or at least to the Soundtracks guideline page.