Swapping music

Putting music from my pc to my moto and found that some of the albums that were put on the phone do not come up in Google music. I downloaded another player and same results. I then downloaded a file explorer and see them but for some reason it says cannot play.
I own the music (I always rip my CD's when purchased and store them) so do not see any copyright issue. They play fine on my Galaxy S5.
Any ideas?