Gabbro - If you like that Biber disc also try "The Seven Words" (Haydn), performed by Rosamunde Quartett on ECM New Series. It is a contemporary take on that piece with no ominous vocals that are usually a part of the piece. It is purely instrumental. Really great performance and recording...another in the same vein of the Biber that stayed on my system(s) for a long time!
Dekay - Some of the older Fado singers (in the traditional realms of Fado) are quite remarkable as well. While in Portugal I got a disc by Maria Teresa de Noronha: WOW! Hard to find here, but worth looking for. She is considered one of the best ever. It's an interesting to hear the older performances of the same traditional songs, in contrast with the same songs by Misia and other contemporaries. I agree, "Ritual" is great! Fado is very emotionally charged and spiritually pure music! Just goes right to the heart!