I think the music needs to be on the SD card. I have an Android phone with a 32gb micro SD card and it works great via the USB port. I have also found that you can hook up an external hard drive to the USB port and it will work as well with the following conditions. A thumb drive or external hard drive must be formatted with the FAT32 file system. For drives larger than 32gb there is freeware on the internet that can do this just google how to format large drives as FAT32.

Also: I think I read somewhere that certain devices needed to be in airplane mode to work with the USB port. I am not sure what type of device they mentioned but I thought is was an Apple product. You might try airplane mode and see if that does anything.

The above works for me in my 2013 GMC Terrain with an Intellilink Navigation system.

 

Joamon I'm having the same isssue. I just got a Galaxy Note II and when I plug in the usb it doesnt know how to access my music. I select the option to use the usb drive as a media file on the phone but I still can't get the music to play. When you plug yours in what do you select to get it to play the music?