Is Bob Dylan's work Literature?

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Bob Dylan won the Nobel Prize in Literature just a few days ago. My American Literature professor enjoys his work and he referred to him and his songs several times now in class. She asked us this questions at the beginning of the class along with the questions "What is Literature?" and now at the end of the semester she asked us it again. She wants us to pick a song or some lyrics from a song and write a paragraph or two on if we think it is literature or not. So I pulled up some of his songs this morning and I can say that I don't particularly care for his songs. I found it hard to understand what he was saying. If it wasn't for the lyrics at the bottom of the screen I would have had no idea what was going on. Now it might just be the songs I randomly picked to listen to but it all just sounded like mumbling to me. Now just because people don't like his music does it mean that it isn't literature? Or is it? What makes a piece of work literature for you? Why do you consider it to be literature? Do you include paintings and computer design, etc. to be literature or just books, poems, songs etc. to be literature?