As its name implies, the File menu in iTunes (and any other computer program, for that matter) is where you go to do things with files: open them, export them, create new ones, and so on.
The iTunes program was made for music, and the first item on the menu creates a new, empty playlist file that you can fill with the songs of your choice from your music collection (Section 4.9.1). Keyboard shortcut: -N (Mac), Ctrl+N (Windows).
When strolling through your library, you can quickly make instant playlists by selecting an artist or album and selecting “New Playlist From Selection” on the File menu (Section 4.9.1). To select only certain songs from the artist or album shown in the song details window, press while clicking song titles. (Pressing Shift highlights all the songs between your first and second selection clicks.) Keyboard shortcut: With the desired songs highlighted, Shift--N (Mac), or just Shift-click the Add button; Ctrl+Shift+N (Windows).
As described in Chapter 4, Smart Playlists work like this: You give iTunes a set of rules, like the bands you want to hear or the genre you’re in the mood for ...