Buried deep in the annals of metal history is the true doom lineage, a timeline of an immortal genre existent since 13th February 1970 - the release date of "Black Sabbath". There have been many wonderful bands since then but few deserving of the echelons created by that Birmingham foursome - read Candlemass, Pentagram, Trouble, Reverend Bizarre and few others. It is time to consider adding PROCESSION to that list.
Samples:
https://www.youtube.com/watch?v=2-pg7j4LkNU