The iPhone tops out at just 8 GB of storage for all your data – including music. Most people have iTunes music and video libraries of much more than 8 GB. So, you’re forced to choose just part of your iTunes library to include on the iPhone. This can take time and a lot of sorting.
But, iTunes can automatically create an iPhone-optimized playlist that you’ll be sure to love using Smart Playlists.
Smart Playlists are a feature of iTunes in which iTunes can create customized playlists for you from your library based on criteria you enter. For instance, you can create a smart playlist that automatically includes every song from a given year. Or, for our purposes here, every song with a certain rating. We’re going to use Smart Playlists to automatically make a collection of your favorite songs from your iPhone.
To do this, you need to have rated the songs in your iTunes library – not all of them, but enough so that a decent percentage have ratings.

