Apple 101 Manuale Utente

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from.  No matter where you get your music from, such as 
the iTunes Music Store or copied from your own CDs, 
attributes will always be looked at in the same way.  There 
is, however, one attribute that will group CDs track 
together and that is the album name attribute.  You can 
group your songs together in a variety of ways including 
year, genre, artist, and play count.  The following list is 
some of the attributes that you should become familiar with 
if you want to make Smart Playlists:
 Album:  This is the album on which a particular track 
was released.
 Artist:  This is the artist who has recorded the track.
 BPM:  Beats per minute (also known as “tempo”).  
This is number value that accurately describes the 
number of beats that there are in one minute of time.  
iTunes doesn’t calculate BPM but you can calculate it 
with a third-party application.  The BPM is a great way 
that you can add criteria to your Smart Playlists based 
on tempo.
 Comment:  This field is “user defined” which means 
that you can use it for whatever purposes you want.  
For example, you might want to include information 
here about certain tracks such as which ones you 
borrowed from a certain friend.