Classical Revolution KC is part of a growing trend to bring classical music out of the concert hall and back into people’s lives via serendipitous discovery. “If you just grab a random 30-year-old off the street and ask, ‘Do you go the symphony?’ they’ll say, ‘No.’ It’s just not their scene,” said Nick Bell, co-founder of Classical Revolution KC, chatting after their “Chamber Music in the Bistro” performance in the bar of Californos in Westport.