Growing up in a musical household, Martin Mangrum was inspired to play horn by his older brother. “When I was 10 years old, I started taking piano lessons and a few months later I had to pick an instrument for my music class at FACE School in Montreal,” he explains. “At the time, my older brother Brian, who is now the new principal horn of the Columbus Symphony Orchestra, had only been playing horn for six months. He could barely play and hearing him try was hilarious. “When I had to choose an instrument for my band class, I thought…