GMC 2007 Sierra 1500 Pickup Owner's Manual page 302

Do not add any label to a CD, it could get caught
in the CD player. If a CD is recorded on a
personal computer and a description label is
needed, try labeling the top of the recorded CD
with a marking pen instead.
Notice: If you add any label to a CD, insert
more than one CD into the slot at a time,
or attempt to play scratched or damaged CDs,
you could damage the CD player. When
using the CD player, use only CDs in good
condition without any label, load one CD at a
time, and keep the CD player and the loading
slot free of foreign materials, liquids, and
debris.
If an error appears on the display, see "CD
Messages" later in this section.
1 PREV (Previous): Press this pushbutton to go
to the beginning of the current track if more
than eight seconds have played. TRACK and the
track number will appear on the display. If this
pushbutton is held or pressed more than once, the
player will continue moving backward through
the CD.
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2 NEXT: Press this pushbutton to go to the next
track. TRACK and the track number will appear
on the display. If this pushbutton is held or pressed
more than once, the player will continue moving
forward through the CD.
3 REV (Reverse): Press and hold this pushbutton
to quickly reverse within a track. Press and hold
this pushbutton for less than two seconds to
reverse at six times the normal playing speed.
Press and hold it for more than two seconds
to reverse at 17 times the normal playing speed.
Release this pushbutton to play the passage.
ET and the elapsed time of the track will appear
on the display.
4 FWD (Forward): Press and hold this pushbutton
to quickly advance within a track. Press and
hold this pushbutton for less than two seconds to
advance at six times the normal playing speed.
Press and hold it for more than two seconds
to advance at 17 times the normal playing speed.
Release this pushbutton to play the passage.
ET and the elapsed time of the track will appear
on the display.