I always talk of loving books and music but definately spend LARGE AMOUNTS OF TIME researching, reading about, and reflecting on philosophy, religion and the history of religions, politics & government, social issues and structures, community and culture, race relations, examining different historical views, etc., etc., etc., etc. In fact, I read alot and mostly read nonfiction pertaining to all the topics I enjoy.
In fact, when they talk of Aspies endlessly going on about their topic to everyone else's boredom (or sometimes to their anger, in my case, when it's an alternate viewpoint), it is usually me going on about these types of issues, not music bands or fiction novels..