For listening to music, you don't need an audio interface if you have a good dedicated sound card. As long as it's a quality sound card with no interference and offers similar output bitrates and depth, you should be fine. A sound card and an audio interface are nearly the same things, but with some specialized features for the interface. An audio interface is really just a specialized sound card that is optimized for recording and music production with XLR and 1/4\\" inputs and outputs as well as latency-optimized drivers.