It seems everyone ignored me. I complete my list, ignoring you and the fact that the title includes the word 'band'. Just because noone said no when I mentioned extending this to non-band music. And these are not in a particular order.

Love

Blind Guardian
Tiktak
Tshaikovski
Mozart
Strauss II
Nobuo Uematsu
Sailor Moon music
Digimon music
Neon Genesis Evangelion music

Hate

Teräsbetoni
Him
Kaija Koo
Yö
Dingo

Don't kill me, I'm sure many of you didn't mention it although you like non-band music as well.