You're right, it reads MP3 and WMA. All my songs are WMA, as I'm taking CDs that I own, and ripping the songs. I won't buy music from Itunes for many and various reasons. The owners manual didn't do much good. It said up to 1 GB SD card. But, what I've done which seems to circumvent the problem is I took most of the music I had on the internal memory of the player, and put it on the SD card and it registered that it was there and played the songs. So now I'm adding to the internal memory and everything's still there at this point!