Ho hahaha you are asking the right guy. Me!! ok there are few best anime songs. I'll catagorize them.
Smoth tone:
Air anime - Tori No Uta, Aozora, fair well song, and back ground summer light.
Xenosaga- In this serenity
Madlax - Your place, Cradle
Hikaru no go - everlasting snow, zutto Konomama.
Fast & Beats:
Initial D - Gamble rumble, dogfight, noizy tribe, blazin beat, and more...
Gundam wing - just communication
Gundam seed - Realize everlasting mix
hikaru no go - get over (both special mix and original)
Slayers - never never give up, reflections, and ect.
Personal fav.
sorry i forgot most of their origins, but you can find them at
www.gendou.com)
Rhythm generation by two mix
Sky high by lia
Nostalgia by lia
spica by key and lia
around the world by unknown artist
exit - running by megumi hayashibara
i think those would do just for now.