https://rateyourmusic.com/ - The most user-driven and comprehensive music database I've come across (except maybe discogs). The site is great for choosing what material to start with if you are exploring a new artist. It is also a treasure trove of charts and all-around music data to explore.
https://www.last.fm/ - Yes, this site still exists and still has somewhat of a community. It is my secondary driver for finding new music these days. I look at what the folks I follow are listening to and use tags to find new artists with commonalities. Been scrobbling on and off for about 15 years. Would have never found a proper Soul Coughing analog if not for this service (MC 900 Ft. Jesus).
While it’s probably taboo to recommend a 4chan board - /mu/ can have excellent content if you look hard enough for it (last.fm , /prod/, /chart/ threads).