Every good series tends to have a good soundtrack and even a good intro. Some of my favorites ones are:
Dark’s intro, look at this beauty.
Big Little Lies also has a good intro
Parasyte has a soundtrack that sometimes gets stuck in my head, you can hear it here
I wonder what are your favorite intros and soundtracks from movies/series?
Attack on Titan is definitely up there on the list:
dunno why I'm just thinking of anime ones right now, haven't even had time to watch any in years. xD