Is it just me or is that poor XML structure? And I think there are problems with it. I have a 2 playlist nodes in a row then I have the tune nodes for 1 of the playlists then the tune nodes for the other playlist.

Although I work with XML and XSL/T every day I do not consider myself an expert or an architect so maybe there is some reason this came out this way.

But it seems to me that it should be more like this
PLAYLISTS
PLAYLIST/ (how ever many there are of these)
/PLAYLISTS
TUNES
TUNE/ (again however many there are but also add a parent node that points to the playlist FID that it belongs to)
/TUNES

Just my thoughts on it. I did not put the LT and GT brackets around them as they get swallowed.