Samsung PN51E6500EFXZA - Manual (Page 545)

N During the slide show, all files in
the file list are displayed in order,
starting from the file you selected.
N When viewing a photo file or slide
show, you can add background
music if you have music files on
same device.
N If you select the wrong
background music, you cannot
change the music until the BGM
has finished loading.