I'm coming from an iPhone, so I'm still learning this android phone. I have all of my music on a SD card and there's been two occasions where my phone was reading the files incorrectly and most of my music was missing. I decided to pull the SD card out and reinstall it. That did the trick where it was reading all of music correctly. Does anyone have a clue why my music is doing this periodically? It's a simple fix, but still aggravating.