the major opening theme song: "Reckless Fire" by Yasuaki Ide ( ep. 1-25)
the major ending theme song:"Drastic My Soul" by Mikio Sakai (ep. 1-25 and opened ep. 26)
and the final ending theme song: "Tabidachi no Kane ga Naru"(which means "The bell of setting out for a journey will ring") by Mikio Sakai ( ep. 26)
i love them all but, reckless fire is my fav. so catchy.
YouTube - Axel's Reckless Fire
love all the theme songs.
ok back to the question days is an ending theme song i think, its been awhile.
now back to the main question my fav. theme song? that is kinda hard to narrow it down to one.
i mention a few of my favs. already. prince of tennis has a good collection of theme songs. i love wonderful days, just love to hear them sing. code geass's colours by flow would be my fav. of that series.
my fav. at the moment would have to be FMA: brotherhood Again by YUI.
well that just to name a few.