Why are my oldest iTunes songs not playing on my SD Card?

[Android Central Question]

I got an SD card and put it in my Kyocera Hydro Reach. I downloaded the Android File Transfer App to my computer and downloaded "Clean Music" app from the Play Store to my phone, so that I can keep my music on my SD Card. But the oldest of my old iTunes purchases, the ones I made on my desktop computer in 7th grade, are NOT playing on this SD card. Newer songs are for the most part. Is it the app? I'm not sure how to use Google Play Music and keep the data on the SD card but if that would help I could do it I suppose.

 

[B. Diddy]

Welcome to Android Central! Are all of the music files in the same directory on the SD card?