I'll tell you what I'm NOT looking for: empty, vapid and unimaginative topics of the "this band is better than that band" or "who do you prefer, band A or band B" variety. Endlessly repeated threads like "what's your favourite album", threads that are already here but the new poster didn't bother to check before creating a new one, threads that put down a particular genre without knowing it, eg "I think punk is crap" or "I find all prog rock boring". And threads made by people with one post which are quite obviously an attempt at self or other promotion.
In a forum like this I like to join threads that are discussing a decent topic and treating the subject with respect, regardless of the views of each poster. I like to see threads about new bands or genres, just to see if they're interesting enough for me to investigate. I love to see threads about bands I like (though the taste of most here is too eclectic and removed from my own for that to happen often, but that's okay), as well as strange, weird topics like "if you could be any animal" or "if you had only two albums in the world you could own, what would they be?"
I like threads with humour, but also serious intent, ie where the subject can be serious but can be sometimes treated with a bit of levity, and I like threads that have something to say, and say it well. I like ones that give me information I otherwise did not have, and I always have time for a thread mourning the recent passing of a musician or related figure.
In short, I like threads that make me think, that show that the person creating them did some thinking themselves before posting, and also that can make me laugh.
Other than that, anything really!
Oh, and local shows don't interest me as I have zero free time away from the house, being a carer for my sister, plus tickets here in Ireland anyway a) are too expensive and b) sell out months before the event. But it is nice to hear people's experiences of seeing a band, so I have plenty of time for that too.