It's utterly expensive for an iPhone case. But it's much more than a case! It's actually a tool to transform your iPhone into an electric guitar. With speakers too!
"Developed by Trinity, the Japanese company behind the Simplism line of budget cases and iPod/iPhone/iPad accessories, The Fingerist ($150) is pitched as an "adapter for playing musical instrument applications on the iPhone and iPod touch.""
Read the full article at: http://www.ilounge.com/index.php/reviews/entry/evenno-the-fingerist-music-adapter-for-iphone-ipod-touch/