Speaking of guitars, I picked up this nifty little camera a few months ago with this very thing in mind. I've always loved the "fingerboard" perspective shots one gets by attaching the camera to the headstock and moving the guitar around. So with some duct tape and a 240 BMP click track I was able to shoot a pick up scene to insert into existing footage on the Bigfoot 2 movie due out in May.
Check it out! I got mine from Dell on sale for $149, they go for about $250 most places (the SD card is extra, they always get you somewhere).