Howdy folks,
I’m soon to be starting a 5th Edition game based thematically on Bloodborne and am wanting an introductory-type theme.
Obviously I can’t have the incredible “Omen” by Ryan Amon from the Bloodborne OST (found here : https://www.youtube.com/watch?v=cKk6XqcmB4Q for reference) but would like something similar if possible.
Any suggestions are most welcome and appreciated.
~Matt
Try the set “Shadows of Esteren - Dearg” - that has a lot of epic-sounding music that reminds me of the link your shared. 
The Esteren soundtrack does indeed have much epic-sounding stuff. However it appears to me to be very “happy, hopeful and heroic.” Whereas I wanted more foreboding and dark. In the end, I’ve gone for the “Scarwall” element, which evokes a “Call of Cthulhu : Dark Corners of the Earth” type feel.