This could be an unfair example, since I don't know the text myself. All I can say is that my skepticism is aroused just by the title of 

* Guerino Mazzola, The Topos of Music: Geometric Logic of Concepts, Theory, and Performance (Birkhäuser, 2002) 

(in other words, topos theory applied to music theory). At least one MO participant at MO (Mikael Vejdemo Johansson) has tried to read this book and came away feeling skeptical, according to his remarks <a href="http://golem.ph.utexas.edu/category/2009/05/the_mathematics_of_music_at_ch.html#c024177">here</a>. I'd be interested in hearing other reactions from people who have taken a stab at it.