There has always been a song change every time a new season begins. In CCS, the song change kinda symbolizes her stage from a naive kid to a mature, powerful sorceress who realizes her responsibility... At least it does sound like that for me.
Wow, nice observation. I think that's all true.
As for the second season's theme, I would like something fast paced. Blaze is okay, but I want something even faster that really gets the adrenaline going like a techno hard J-Pop rock song or something, lol. I like Loop, too, and for the new credits, I'd like to see another romantic song with even more S+S in it.