We're rewinding back to 1833 to answer today's Geo Quiz. That's the year Christian Frederick Martin left Germany and moved to the United States. The Martin Guitar company has been building its signature acoustic guitars ever since. This year marks the company's 175th anniversary.

Listen to our interview with Chris Martin IV, CEO and chairman of the Martin Guitar Company in Nazareth Pennsylvania who tells us about his great, great, great grandfather who grew up in Markneukirchen, Germany, the answer to our Geo Quiz.

C.F. Martin came from a long line of woodworkers --- by the age of 15 he was an apprenticing at a guitar workshop in Vienna, Austria. By 1883 he was on his way to America to launch what would become the C.F. Martin Guitar Company.

C.F. Martin

You can hear Chris Martin's thoughts on:

CM on how the design of a Martin guitar has changed since the 1830's:

CM on the challenge of finding new woods to build guitars as supplies of traditional Brazilian rosewood, African ebony, and mahogany dwindle:

CM on next week's auction at Christy's, New York City, of 50 rare Martin guitars in honor of the guitar makers' 175th anniversary:

CM on the increasing popularity of guitars compared with declining sales of recorded cds and music: