One of my main hobbies. Not just that, but my method of dealing with emotions, focusing, working effectively, expressing myself, preventing boredom, taking my mind off the world, bringing me up when I feel down, it's my main source of enjoyment, main source of happiness, my culture, my community. I enjoy learning about it, absorbing content, creating it, playing it. I even mod two communities here and post to other peoples'.
So yeah, it's pretty much my entire life at this point. Wouldn't be here without it. I probably spend more time awake, listening to music, then not. And when I'm not, I permanently have a song playing in my head.
To answer your question about devices, I like to listen through devices that allow me to get as close to the way the artist intended it, as possible. Whether it be good-quality peripherals, listening digitally or listening to vinyl.
The irony is, a lot of music I gravitate towards has many imperfections, which to me, is what makes it human, real, and ALIVE. It is far more powerful at conveying true emotion and is thus more meaningful. So even when listening to music which was poorly recorded to begin with, I still prefer listening through good quality speakers for example, because it is more true to the original sound.