I just got in my nice, 64GB SD card and I created a folder called music in the root of it and copied a lot of my songs over. Play Music however doesn't see them when I go to Device instead of all. I know the card is working fine, Astro and everything else sees the card and all the files on it, and I can even choose the music for ringtones. This makes me believe it's not a problem with my S4. Am I doing something wrong? Maybe need to rename the directory something else for Play Music to see it?