Itunes download error "You do not have enough access privileges for this operation" operation"

Had the same thing happen to me today. Go to User(your home folder)/Music. Select/highlight your "Music" folder. Then do Command-I ("Get Info" from the File menu), click on the padlock icon in the lower right of the new window. Enter your user password. Click on your username just above the now-open padlock. Select "Read & Write" if it's on "Read Only," "Write Only," or "No Access." Now having your user account with "Read & Write" privileges (it may have been this way already; still do this next step), click on the gear on the bottom-center of that window. Click on "Apply to all enclosed items." When the pop-up says "Are you sure?" (or the equivalent), say "yes." This will grant access privileges to your user account for all the music files inside your music folder--all your iTunes stuff included). Then you should be good to go.