Shop for your Martin Guitar at The Music Zoo now! Martin is one of the oldest companies in the US. They have an incredible heritage of building the finest sounding acoustic instruments in the world. We love Pre-War Martin 000-45 guitars as well the more intimate parlor 0-42 instruments. And of course, Martin is responsible for the most iconic guitar of them all, the Dreadnought! Hank Williams sure enjoyed his D-18 while Johnny Cash preferred an all black D-35.