Samsung MM-A920

Okay so I bought my Samsung A920 a couple weeks ago, I bought the Card reader so I can put songs on it for the MP3 player. I initially put the songs in the "MUSIC" file but then tried putting it in the "MEDIA PLAYER" file. The reason I put them in the MEDIA PLAYER file is because when I connected Head phones to the cell phone it wouldn't play the music.. But yet it plays the music just fine with the speakers (so w/o headphones). So when I put the songs in the MEDIA PLAYER it does the same thing... I can't listen to the music when headphones are connected!? Has anyone else had this problem?? If so how can i fix this? Headphones work fine when talking on the phone.. Thx in advance! 😎