By Richard Mallion
Quit iTunes if it’s open, then open a Terminal window and type the following:
defaults write com.apple.dock itunes-notifications -bool TRUE;killall Dock
Then start iTunes and try playing a track. The pop-up fades away after a few seconds.
To add the iTunes icon to the pop-up window, type the following into a Terminal window:
defaults write com.apple.dock notification-always-show-image -bool TRUE; killall Dock
To deactivate the pop-up at a later date, quit iTunes again, then open a Terminal window and type the following two lines: