How do you edit multiple songs on iTunes?
The easiest way to edit multiple songs on iTunes is the click on
all the songs you want to edit while holding down the apple button.
That should make all of the songs you clicked on become
highlighted. Then when you have selected all the ones you want to
edit, just right click on one of the songs and select Get Info.
Then a warning will pop up asking if you are sure you want to edit
multiple songs at once and just say yes. There you go!