Ah, well if comparing streaming services is the goal then I certainly have done my fair share of that, as my comment and post history will attest 😄

I did a similar thing, although for me it was testing Spotify versus other streaming services.

As an aside, my testing on Spotify/Deezer showed that they generally use the exact same masters, for whatever reason.

Anyway, I used Audacity and WASAPI loopback recording to take samples of the different services and analyze the results though a combination of A-B comparisons using Audacity and blind ABX testing using Foobar.

These methods may prove useful to you if you want to continue your testing without bothering your girlfriend, lol.