Anime opener?
Closer?
My personal favorite of all time favorite would have to be without a doubt Cruel Angels Thesis from Evangelion followed by the Sailor Moon Stars opener, don't remember it, but the one that I call Makenai
My personal favorite closer is tough cause I have more than one. >.< There's Life is a Boat by Rie Fu, which is the closer for Bleach, then there's Oranges and Lemons singing Raspberry Heaven from Azumanga Daioh.
FYI mods, I searched more than once and in more ways than one for this very topic. So it's either well hidden or doesn't exist. XD