GMC Envoy Owner's Manual page 224

Order of Play
Tracks will be played in the following order:
•
Play will begin from the first track in the first playlist
and will continue sequentially through all tracks in
each playlist. When the last track of the last playlist
has been played, play will continue from the first
track of the first playlist.
•
If the CD does not contain any playlists, then play
will begin from the first track under the root
directory. When all tracks from the root directory
have been played, play will continue from files
according to their numerical listing. After playing the
last track from the last folder, play will begin
again at the first track of the first folder or root
directory.
When play enters a new folder, the display will not
automatically show the new folder name unless
you have chosen the folder mode as the default display.
See DISPL later in this section for more information.
The new track name will appear on the display.
File System and Naming
The song name that will be displayed will be the song
name that is contained in the ID3 tag. If the song name
is not present in the ID3 tag, then the radio will
display the file name without the extension (such as
.mp3) as the track name.
Track names longer than 32 characters or 4 pages will
be shortened. The display will not show parts of
words on the last page of text and the extension of the
filename will not be displayed.
Preprogrammed Playlists
You can access preprogrammed playlists which were
created by WinAmp™, MusicMatch™, or Real
Jukebox™ software, however, you will not have editing
capability. These playlists will be treated as special
folders containing compressed audio song files.
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