Seems like no other people will visit the video in like a year from now, but I think Glorious Crown dethrones most of these songs.. Definitely the most difficult Chaos level for me.
I would take an old chapter L chart as number 1 over freedom d↓ve anyday. The hidden chart for freedom dive shouldn't have existed and rayark only added a hidden chart to milk it dry.
It took me ages to find Morfonica, forget their songs, the band itself is very much unknown to me, the other 6 bands are pretty familiar to me in Seiyuu, story and songs.