My songs I put on my Micro SD Card does not appear on Samsung Galaxy S5! Here's what happened. Recently i bought myself a 128 gb Micro SD card. I added all of my music, which takes up 30 gb of the SD Card. When I open up music player i don't see all of the songs i put, only about a handful of them. I only see like 2 GB of the music. Please Help!
Use a file explorer (e.g ES file explorer ) and view the contents of your SD card and select and copy your music to the file path  on your internal storage at:

storage/emulated/0/Android/data/com.google.android.music

Then close and restart Google Play Music and go into the menu and select Refresh. Then your music should show up. 

Note: The file path may be slightly different depending on the phone but you'll be looking for the subfolder com.google.android.music