Watch as I try to play the World’s Smallest Violin song, but there's a twist – my instrument keeps shrinking! It's a ...

An curved arrow pointing right. You might have pretended to "play" the tiniest violin in the world to your whiny friends before. You can now literally play them the world's tiniest violin.

The FretPen is the world’s tiniest guitar which synchs with your smartphone and lets you play electrically and acoustically anywhere you go. The WSJ’s Adam Najberg rocks out some tunes and ...