how to fade in and out songs on iTunes

Did you know that iTunes allows you to easily fade in and out songs, so you can play tracks from your playlist without interruptions?. If not then you can easily do this from the iTunes library:

Open your iTunes
Click on Edit and then choose preferences
Navigate to the Playback tab
Click the crossfade box, and set the crossfade interval (between 1 to 12 seconds) using the slider
Hit OK
iTunes will now apply your crossfade settings to all the iTunes library songs.