Essentially, guitars are just a series of math problems: magnets pick up electricity, and they make the sound ... with the highest quality you could imagine in a relatively expensive but not ...

More from So Expensive Editor's Note: In the video we say spruce is used for the bottom of the guitar, but Martin Guitars typically uses rosewood for bottoms. Martin acoustic guitars are some of ...

Back in July, it was announced that Rory Gallagher's guitar gear would, three decades after the blues-rock titan's untimely passing, go up for auction ... one of the most expensive guitars ...