A lot is while I'm working - sometimes it's full albums on Spotify, sometimes random youtubes from blogs and other sites that I follow. It's usually headphones in the morning (Grados) and a bluetooth speaker once my girlfriend has left for work.
Some is in evenings, while reading or cooking, usually on my stereo (Onkyo receiver, Denon turntable, I forget what brand my CD player is).
I used to listen to a lot on headphones (Shures, which are better for walking around with than my Grados) when I had a 1.5-hour-each-way commute. Now that I work from home, I sometimes will walk around aimlessly with music on to get out of the house. I often listen to Spotify's auto-generated, customized Discover playlist and play a game where I guess the artist for each song without looking. (It tends to be way too many current mediocre indie bands, which are hard to get, but there's usually some stuff I know and some I can guess.)
I have a lot of mix CDs and playlists that usually get played in the car on longer trips. For short trips, I often just shuffle a big Spotify playlist I have called "Songs That Are Good" which contains just that.
I've never really had the patience to sit and listen to music without doing something else. Increasingly, I don't even have the attention span to do that with TV and movies, which I worry about a bit. I've also never been one to listen to an album a bunch of times in short succession - I often don't come back to albums for months even if I like them a lot on the first few listens.