Rating songs and other items
You can assign a rating to a song, album, video, podcast, or other item to indicate how much you like it. You can use ratings to help you automatically create playlists or to sort and browse your library.
To display the Rating (for songs) or Album Rating column, choose View > View Options and then select the options.
To assign a rating:
Select the items you want to rate, and then click or drag in a rating column to add or remove stars.
When you rate an album, all of its songs are given the same rating. You can change a rating by clicking or dragging to add or remove stars. If you rate tracks but not the album, iTunes displays the rated songs’ average as the album rating. Stars that iTunes assigns are hollow; stars that you assign are solid.
You can also add ratings by right-clicking an item and choosing Rating.