Around 6300 people who have searched for a 'Forum for discussing about specific songs' reached needgap last month - https://twitter.com/needgap/status/1422439242404298752. I wonder whether the pandemic has rekindled interest in music forums.
There's not much technical barrier to create a forum, A discourse forum with embedded Spotify player should do. What's crucial is reaching the critical mass, Which would take several years and so the forum needs to be run by those who love music and keep the community's interest on the top.