The Guitar Sidekick is a neck-mounted clamp system designed to hold a SmartPhone, MediaPlayer, recorder, or tuner. The system enables you to use music/guitar apps for smart mobile devices, such as: video lessons, lyrics teleprompter, audio recorder, metronome, tabs display, and instrument tuner. Compatible with any guitar, it accommodates the iPhone, iPod touch, PSP, iTab, and others. Check it out at castiv.com.