Create a Smart Playlist
iTunes can create playlists based on rules you specify, and then update these playlists automatically as your library changes.
For example, you could create a Smart Playlist thats no more than 5 gigabytes (GB) in size and includes your most highly rated jazz songs. Or you could create a Smart Playlist of songs by a particular artist. When you import a new CD by that artist, the songs are added automatically to the Smart Playlist.
If you want to create more complex rulesfor example, with some criteria matching all rules and others matching anyyou can create sets of rules, or nested rules. You can have up to five levels of nesting.
A Smart Playlist has this icon next to it. iTunes comes with several Smart Playlists already set up, including My Top Rated, Recently Added, and Top 25 Most Played.
Create a Smart Playlist
Choose File> New> Smart Playlist.
Specify your rules.
To add another set of rules, hold down the Option key and click the Nest button. (When you hold down the Option key, the Add button changes to the Nest button.)
View and edit Smart Playlists
View your Smart Playlists: Choose Music from the Library pop-up menu and click Playlists.
Change a Smart Playlist: Select it and click Edit .
Remove a Smart Playlist: Select it and press the Delete key.