A couple of my buddies run a nifty online literary journal called The New York Moon, which often contains remarkably unique multimedia features. They generally favor creative innovation over practical application (their "Twitter radio" idea left me scratching my head), but the current issue's Film Festival for the Blind is something of a revelation: Music for non-existent movies.
I'm especially enamored of Diego Stocco's dramatic score for a "Lynchian saga" called A Festival of Death, although Wesley Harris's trippy techno riffs for Mirror, Mirror, an imaginary entry in the "Abyssinian space romance genre," kinda blew my mind (and continues to haunt my head). Meanwhile, Zack Sultan's gorgeous poster art rivals anything Criterion has to offer. Check it out here.
Does this concept have any practical application? If applied to modern crowdsourcing dynamics, absolutely. Imagine what might happen if another group took cues from the music and the poster art to write a screenplay, while others worked on special effects...well, you can probably see where this is headed.
A Swarm of Angels, RiP: A Remix Manifesto, Lost Zombies and a few other projects have toyed with open-sourced filmmaking strategies, but I have yet to see a collaborative filmmaking project that started with a soundtrack.
I would love to hear someone elaborate on this topic at the next DIY Days, which takes place in Philadelphia at the beginning of next month. I'll be there.