Ok, so apparently I've been a bit unfair to the Swedish song.
When I first heard it, I thought "this should be a banger, but why did they send someone who can't quite hold a note and is consistently the slightest bit flat the whole song?". It ruined the song for me.
The singer, Felicia, had a cold and a fever while performing. Two days ago she fainted during rehearsals, and in yesterday's grand rehearsal she reduced her participation to strictly her performance of the song. Even in the Melodifestivalen final back in February something was a bit off.
If you listen to her first performance, her high notes have better support and the whole song is much better.
Felicia: "My System" (live, Gothenburg, Melodifestivalen Heat 2)
youtube.com/watch?v=-7AB53ZNXp…