Create a Smart Playlist in iTunes on Mac
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 that’s 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 automatically added to the Smart Playlist.
If you want to create more complex rules — for example, with some criteria matching all rules and others matching any — you can create sets of rules, or “nested” rules. You can have up to five levels of nesting.
Create a Smart Playlist
In the iTunes app
on your Mac, choose File > New > Smart Playlist.Specify your rules.
To add another set of rules within a rule, hold down the Option key, then click the Nest button
. (When you hold down the Option key, the Add button changes to the Nest button.)
A Smart Playlist has the Smart Playlist icon 
next to it.
View and edit Smart Playlists
In the iTunes app
on your Mac, choose Music from the pop-up menu at the top left, then click the playlist you want to view in the sidebar on the left.Do one of the following:
Change a Smart Playlist: Click Edit Rules.
Remove a Smart Playlist: Press the Delete key.