Enable Half-Star Ratings in iTunes
iTunes allows users to rate songs on a 1 star to 5 star basis, song rating data can then be used for a variety of purposes, either for your own reference or for creating custom play lists that only include songs rated over a certain star value. But what if a song is somewhere in the middle of the rating scale, not quite worthy of 4 stars but not a 3 star song either? For more precise personal ratings, enable the half-star rating option in iTunes.
Launch the Terminal, found within the /Applications/Utilities/ directory, and enter the following defaults write command:
defaults write com.apple.iTunes allow-half-stars -bool TRUE
Quit and relaunch iTunes for changes to take effect. To give something a half star, click and slide the star rating scale until the 1/2 value shows.
To remove the half-star rating option use the following defaults command and then relaunch iTunes again:
defaults delete com.apple.iTunes allow-half-stars
Removing the half stars moves the song rating to the star below it, so a 3 1/2 star song would turn into a 3 star song, and so on.