Hey forum, I've been playing bass for a little over a year now, but recently decided I wanted to start recording stuff to Youtube for some constructive criticism. I've purchased an audio interface (M-Audio Mobile Pre) and have succesfully recorded myself playing a few times, but i can't seem to figure out how to record myself playing with/over a piece of music I'd like to cover. People do this all the time on Youtube, but when I attempt to record with music playing via Windows Media Player or Spotify, I don't hear the music when I playback the recording; I only hear myself. What am I doing wrong? I haven't been able to figure it out and it's getting a little frustrating lol... Help?