Trettioariga Kriget are my favourites of your recommendations that are on Spotify.
I am sure the type of soundcard you use does affect the sound, in the same way different DACs offer different performance. But as per the thread DAC vs Soundcard, I do not think that any soundcard does as good a job of digital to analogue conversion as a DAC designed for use in a hifi system.
On another forum (house rules prevent linking to it) I have been reading through a large thread on the EMU 0404 soundcard. There are claims it is as good as a Bechmark USB DAC, one of the most expensive DACs out there, but those claims are generally rubbished on the thread. But there is a comparison between the EMU and a Beresford DAC which is in the £100 - £200 price range and it states that the Beresford is a warmer source than the EMU0404 and has a more expensive quality of sound. The EMU on the other hand, has more detail. The Beresford is more musical and the 0404 is more analytical and cold. Both are very good products for the price, and it depends on which sound signature you prefer.
So I take it from that the EMU is good, but the Beresford is designed more for the music lover. So that goes back to my original thought that for music you are better off with a purpose DAC as opposed to a soundcard. But, there is no reason wht a soundcard cannot produce good music. Ah, the joys of hifi and trying to find the right product!