Thank you for your response!
I'm using iTunes 11.0.4 (4) on a MacBook Pro.
"Are the rating stars you are seeing solid or just outlines?" --- They are all solid. There are no outline stars.
"Maybe you did that accidentally for some songs." --- "some" songs, you say? :-) It's more like 60% of my songs and I have "163 albums, 5.7 days, 15.24 GB"! It is utterly impossible for me to accidentally click on the rating item for so many songs. And all of the starred songs get four stars, nothing else, which is impossible for accidents to result in.
Are there any shortcut keys or something I often use without knowing that that invokes rating?
"I do not know of any way that will apply ratings without your contributing."---That was exactly my conjecture, hence my question.
And thanks for your explanation on what ratings do. That was very clear.
Cheers,
Ryo