There are lots of message boards out there devoted to music. This website is about the technical aspects of sound reproduction, so of course we will spend a lot more time here discussing that.
Music listening is a purely subjective experience, but accurate sound reproduction is quantifiable. Musical preferences are so personal that you can say what you like, but there is no way to resolve disagreements, recording X can never be better than recording Y. I don't talk about the music or movies that I listen to around here very much, because most people here would likely not ever have heard of the artists or even the genres that I enjoy. Most of our musical tastes are formed when we are younger and become ossified. A lot of the higher-end two-channel systems I have seen are really just shrines for some old rich guy's favorite albums of their youth. I am not even criticizing that, I can understand it, and I deeply love much of the music of my life as well.
But think about the significance of having a home audio system- music in general becomes more of a personal experience instead of a shared experience, and so we have less in common to discuss as far as actual music content goes. It is an inevitable drift of our culture, it will fragment, and the 'top 20 hits' don't mean as much anymore. How many of the current top 20 do you know? Looking over the current billboards top 100, I don't know any of them.
Anyway, just because there is not as much discussion of music around here doesn't mean that many of us are more concerned about our gear than our actual tunes. I have spent far far more money on music recordings than I have spent on audio gear, but if you only read my posts here, you might not guess that to be the case.