Hmz.. i like almoast all naruto music... after that i love wolf's rain intro and ending songs.. i loooove the intro song in helsing ..i love the ones in hunter x hunter some times.. evangelion... well.. almoast every begining and ending song cause when i watch an anime i try to learn the japoneze words and also sing in the same time so everything would be fun 😄
as a matter of fact i love every melody made by japoneze and the bluez or something ssimmilar to that like in couboy bebop.. wolf's rain..etc..
The best use of classical music has to be Evangelion.... Asuka dying to the muted strains of Bach's Air on a G-String has to be one of the most moving and poignant pieces of cinema anywhere... also the string quartet scenes with Shinji, Rei, Kaworu and Asuka performing Pachelbel's Kanon in D is just beautiful... and the use of Handel's Messiah throughout... especially in the battle with Kaworu.... is genius... As for original music, then it would have to be Noir... especially Kirika's theme....