cell phone? I have 3 CX-75 Siemens cell phones, the music is definitely on the card, and when I click on it, the titles go by, but I can't hear the music.

The audio codecs on your phone must be corrupt. Try resetting the phone to factory settings or if this does not help, take it to the service station. I would also recommend to check your music files that they are not corrupt. Try to send these files to your PC or friend's phone and test it to be sure that files are good.