When I insert a USB stick in media mode there is very briefly a pop-up saying "Powered by GraceNote". I have Googled this and it seems to be what used to be called CDDB, the Internet database of CDs and mp3s etc. It is supposed to obtain the artist, title information and album art, apparently. Since we have onstar and an Internet connection, should this be working because it doesn't seem to be. Some of the tracks on my usb stick have the meta data and album art and some don't. The ones that don't are not being filled in by GraceNote.