Motorola E815 / E816 Hollywood

Can someone please help me? When I put my mp3s onto the microSD card in the "motorola->shared->audio" folder, with my sd card reader/writer,they transfer and show up fine. The problem is when I put the card into the phone, there are songs missing at random. I would like to be able to have my cds on my phone as separate playlists so as to navigate easily. I just traded in my a950 due to awful recepetion, but the music library on it was super easy. There must be a way to achieve that with this vastly superior phone...