To be honest, I'm not seeing how the choice of music for Louise's paso could be considered either perfect or evidence of favouritism.
This pseudo-classical track is far from traditional and I admit to being unfamiliar with it until yesterday. There are other far more well known and popular music choices for the dances this week which seem to me more audience friendly. I saw it mentioned that Emma Bunton danced to it and when I looked her dance up on YouTube, I was underwhelmed by the music.
Yes, Louise got traditional music for her AT but her foxtrot song was awful, having previously been used on Strictly for a Cha Cha and her Charleston music didn't work for me either.
Danny had great music for his quickstep and a more traditional sound for his paso; Robert Rinder had songs which suited his quickstep and foxtrot the past couple of weekends.
As for Ed, apart from his week one waltz, he has been given dances, themes and music where he could bring a fun or showy element and this has made it much easier for him to do an entertaining performance and pick up votes.
All couples get what they are given and have to work with it and I feel that everyone has had some difficult choices and some good choices.