the problem is that the XML for is not displaying?

No Germi.

I have made some changes in the MusCol to secure my resources (MP3s), and now they don't appear in the View Source option.

However, I've found that Google has indexed XSPF Playlists of my site, which gives away all the resources.

When:

?format=feed&type=xspf

is added at the end of a URL: e.g. www.music.com/a/andrew/album1.html?format=feed&type=xspf

It gives all the resources in an XML playlist file.

Any way to stop this happening automatically and displaying this XSPF?

I have followed this thread and made changes accordingly, but now joy, below is the URL of thread i'm referring to:

http://www.joomlamusicsolutions.com/en/forum/joomla-2-5/playlist-cookie-resource-access-problems-3.html

but.. this XSPF file is used by the player..! if you "delete" it.. songs won't be playable on the player...!!

Okie.
Well, i've edited my robot.txt in hope that crawlers/spiders won't index or cache any query strings and xspf playlist won't be index also.
Thanks anyway.