Shingeki no Kyojin OP 1
(Attack of Titan)
“Guren no Yumiya (紅蓮の弓矢)” by Linked Horizon
used as OP for episode 1 – 13.
Do I really need to explain this opening?
The music itself is not necessarily well-sung, but definitely to convey a sense of grandeur, a sentiment that is much needed for this anime. Compared to the rest of the anime, pictures in OP uses a darker hue, and the animation uses the flashing technique (briefly show one scene and then change it with a flash).
The overall effect … very well-done.