GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 300

To change from playback by artist to playback by album,
press the pushbutton located below the Sort By label.
From the sort screen, push one of the buttons below the
album button. Press the pushbutton below the back label
to return to the main music navigator screen. Now the
album name displays on the second line between the
arrows and songs from the current album begin to play.
Once all songs from that album are played, the player
moves to the next album in alphabetical order on the
CD-R or CD-RW and begins playing MP3/WMA files from
that album.
To exit music navigator mode, press the pushbutton
below the Back label to return to normal MP3/WMA
playback.
BAND: Press this button to listen to the radio when a
CD or a DVD is playing. The CD or DVD remains inside
the radio for future listening or viewing entertainment.
3-116
DVD/CD AUX (Auxiliary): Press this button to cycle
through DVD, CD, or Auxiliary when listening to the radio.
The DVD/CD text label and a message showing track or
chapter number displays when a disc is in either slot.
Press this button again and the system automatically
searches for an auxiliary input device, such as a portable
audio player. If a portable audio player is not connected,
"No Aux Input Device" displays. If a disc is in both the
DVD slot and the CD slot the DVD/CD AUX button cycles
between the two sources and not indicate "No Aux Input
Device". If a front auxiliary device is connected, the
DVD/CD AUX button cycles through all available options,
such as: DVD slot, CD slot, Front Auxiliary, and Rear
Auxiliary (if available). See "Using the Auxiliary Input
Jack(s)" earlier in this section, or "Audio/Video (A/V)
Jacks" under, Rear Seat Entertainment (RSE) System on
page 3-129 for more information.
If a MP3/WMA is inserted into top DVD slot, the rear seat
operator can turn on the video screen and use the remote
control to navigate the CD (tracks only) through the
remote control.