How do i put music on my samsung messenger?

I just bought a samsung messenger. I have a memory card and there is music on the memory card. But when i go under music player it says there nothing there.How do i put music on my samsung messenger?Make sure that the memory card is in the phone the right way. When the card is in the phone right, it should have a little icon at the top of your screen that looks like a memory card. I have this phone and loaded music on it this way.