One title that instantly comes to mind for me is Genesis of Aquarion. I admittedly never got very far into it because it’s really awkward to watch with other people around (looking at you mecha combining scenes). I actually really only checked out the show because I heard the OP in Taiko no Tatsujin Portable DX.
Anyway, the song is also called Genesis of Aquarion and is by AKINO.
Etrian Odyssey
I tried the demo for the fourth one and just didn’t really like or get it. A couple years later Atlus announced Persona Q (which has mostly the same gameplay as Etrian Odyssey) so, I decided to give the demo another try and it just clicked this time. I have no idea why I didn’t like it the first time around.