^Oh yes so much on Sound Horizon, they're (well it's Revo mostly lol) really talented and interesting!
Their music is dark sometimes cheerful, eerie, sad and mysterious with epic sounds here and there
They incorporate multiple singers in their releases with stories in each songs or the whole album as a story book, and their live is like musical crossover with cosplay!
Oh yeah, they made Bravely Default OST and Shingeki no Kyojin OP theme under the name of Linked Horizon
Miisan had put links to their dark neoclassical rock songs, I'll put some ballads then
Kono Semai Torikago no Naka de (Vocal by Joelle)
here
Hana ga Chiru Sekai (Vocal by Joelle)
Yorokobi to Kanashimi no Budoushu (Vocal by REMI)
11 Moji no Dengon (Vocal Rikki, the singer for FFX Suteki Da Ne)