Can't get simple Automator actions (services) to work

Question

I've been trying to get very simple Automator services to work in 10.6.2 but I can't. Here's an example.
I launch Automator, and hit Services, then choose:
Service receives selected: audio files in: any application.
Then add an action: Set Info of iTunes Songs, and fill in some of the fields. Then I hit save and give it a filename "iTunes Assign Info."
When I go to the Finder and right-click on an MP3, I see an option there for "iTunes Assign Info" and I select it, but it doesn't work -- the file never gets those properties.
Same thing happens for a similar action for graphic files:
Service receives selected: files and folders in: any application
Then I add some resizing and scaling actions. Then I save. I test by right-clicking on a JPG in the finder, choosing my action, but the action never takes effect.
What am I doing wrong?

Answer 1

David Das wrote:
On the 1st: an iTunes song is an MP3 (or AAC, or WAV, or AIFF). There's no difference.
oh yes, there is.
this is a computer program. it has to be precise. it only understand input of certain format which in this case is an itunes object not an mp3 file. the action uses scripting tools of itunes. it only works with with items in itunes library. and it says so. to use it you'd have to import the track into itunes first, change the title info and spit the file back out. there are scripts out there that do that. look here
http://dougscripts.com/itunes/
there may be one that does what you want there already.
And Automator allows such a file to be passed from the Finder to it. Plus the metadata gets written directly to the file (not to iTunes), therefore, that action should work. (The description doesn't say it won't; it slightly implies that it will.)
Anyway...
On the second (image resize), I should have mentioned that I tried it both with and without Get Selected Finder Items and neither works.
works perfectly for me as a service without "get selected finder items".