Largely it's the music, and the books, movies, plays, comics, painters and designers. People get passionate about "their music", or musicians they enjoy. At once protective and defensive, as if the songs they enjoy were their own creations, their work. De gustibus non est disputandum.
And yet, with all this passion for their work, Artists are constantly struggling. Grappling with the image/word/chord/etc, struggling for recognition, struggling against society and struggling amongst themselves. "Artist" is not an acceptable career. I hesitate when asked "What do you do?" because people who call themselves Artists are seen as irresponsible, mentally disturbed flakes. Stigmatized and lauded in the same breath.
Think about that.
How do you define yourself? How do you define Art? What is your passion? Are you working on something you care deeply about? If not, why not?