For Fafner, the Warsaw Philharmonic Orchestra is listed on the official website. That should be nice.
If you like orchestral music, Natsumi Kameoka's KanColle score will be one to check out based on the two PVs they've released.
https://www.youtube.com/watch?v=3u-WE85ExIU
https://www.youtube.com/watch?v=ABZN292gvRo
I'm also interested in Yukari Hashimoto's Yuri Kuma Arashi. I think Penguindrum is her best work so far and this new show is from the same director as Penguindrum. I think he has a way of bringing out the best in her.
https://www.youtube.com/watch?v=9J93cF-I-xA