I'd personally love to see a music subforum and I think it would be a great little addition to the site. The "Post what song you're listening to" thread could go in there which could help draw people in, and it would be a nice little space for people to post about specific bands/generes/subcultures and get recommendations. The thread I mentioned is great to peruse for fun, but it's really not viable at all to get any information or recommends since it's just a complete mess of every genre and type of music. I realise technically people could post about music in the entertainment subforum, but I really think it warrants a separate subforum (inside "Entertainment").
In fact, I feel like entertainment in general could use some more direction - I feel like splitting adding both Music and Movie subforums would help boost a bit of activity in there. At the moment "Entertainment" is just a mess of everything, and it's all dead threads because no one knows what to talk about in there. In my opinion.
But personally I don't care much about movies and I'm just here to advocate for the Music subforum