It goes without saying when you're talking to a music journalist, but music can be the greatest inspiration for a writer. Even if you're not writing about the music itself, it can still be an indispensible catalyst for the written word. More and more in modern literature, the afterwards feature a list of artist that the author was listening to while writing.
Beyond that, however, is a whole new realm of two sensory inputs. There are actually books and albums that are designed to intertwine and complement each other. It's not a common occurrence, but there have been some pretty impressive collaborations over the years.
League of Extraordinary Gentlemen: Black Dossier/"Immortal Love" single
Ask any ten people on the street to name a comic book writer and the odds are good you'll hear Alan Moore's name. He completely redefined everything about the medium through V for Vendetta, Watchmen, Swamp Thing, The Killing Joke, and more than we have room to name.
Our personal favorite work is the massive fictional crossover series League of Extraordinary Gentlemen, in which the finest figures of Victorian and Gothic literature are all united under one literary canon. They even made a movie with the same premise and the same name which we could call an adaptation with about as much sincerity as we could call Willow an adaptation of The Hobbit.
The third collection of the series was supposed to include a single of two original songs sung by Moore himself. Before you go, "huh?' you should know that Moore has released several albums in the past under the moniker The Moon and Serpent Grand Egyptian Theatre of Marvels.
No less a figure than David J of Bauhaus is a member of the group. Sadly, DC decided not to include the 45 rpm single in either the original run or in the Absolute reprint. Currently, we're still waiting to hear it.