I listen to music every chance I get.
The only real variable is the type of music to which I listen, depending on the mood I'm in, or the type of mood I want to invoke. And, I like to try and "match" my audio system to the musical era to which I'm listening. I have combinations that work best for jazz, rock (60s - 06), classical etc.
When my wife and I turned 40, we both vowed to try something new and different at least a few times per month -- music, type of book, movie, experience, radio station, food, etc. As a result I now listen to, in no particular order: Rock, jam bands (rock), jazz, folk, classical (various composers, types, etc), world, etc.
At work I listen to jam bands (moe, Gov't Mule, Allman Brothers) or jazz when I need to focus on a writing project as it helps me concentrate.
Its a central part of my life and contributes to my emotional and psychological well-being as much as food, shelter, paycheck, love, etc.