Music
Music qualifies as my favorite hobby in life. I may say that I like all flavors/genres of music, however, the line between music and noise is relatively drawn.
You can also find a list of my favorite tracks at http://arkanath.com/songs.html.
In my Last.fm profile there is a rough log of what I listen to every day.
I play the Piano/Keyboard and occasionally give my attempt at other musical instruments.