There's a song in episode 174 of Bleach from 2:43.
I couldn't find anywhere on YouTube/Google, even after I checked all the soundtrack lists.
What is this song?
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It's an unreleased OST called Soul Society by Bleach's music producer, Shiro Sagisu (YouTube).
Quote from OP:
I found it. Can't believe I found it. It was so hard that even in the comments people say that found it by mistake and was not on purpose. I spent 5 years looking for this and I found it. https://www.youtube.com/watch?v=gntBKXOrppI (YT: #10) BLEACH OST - Shiro Sagisu - BL_93 (Soul Society)) for anyone in my position