how do i get music onto a mp3 player when connecting it via usb chord

[Anifreak]

since you want answer my other topic ill be more general. Ive got all the music onto my media player and now i just need to get it onto the mp3 player. It doesn't need to have any speficic file type it can support wav and mp3 and my music is in wav...I think. So can you plz help me