There's music that takes a long time to 100% appreciate -- but I can tell pretty quickly tell if I'll even be able to appreciate any quality of the music enough to listen to it for long periods of time. Luckily, I like probably 80% of the things I hear right away -- I only love probably 10% I hear right away however.
Being dismissive of a band isn't being closeminded, at least not in my case -- I'll listen to a whole album of a band I'm not into before I completely dismiss it. Bad music doesn't grow on me; good music grows on me to become great music but I've never heard a band I've completely hated at first and learned to love it later.
I just don't see the point in trying to like a band.
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