On any given night, Nashville drummer Bobby Mertz can be found backing an aspiring artist at a local showcase, recording tracks in his home studio for a song demo, or touring the country as part of jazz superstar Kenny G’s entourage. But there was a time when Bobby marched to the beat of a different drum. Right after high school, the Pennsylvania native joined the US Marine Corps just prior to Operation Desert Shield/Storm. For four years, Bobby flew all over the world in a p