Orrin Evans

Josh Goleman / Courtesy of the artist

For the last 17 years, The Bad Plus has been a model of musical cohesion. Its members — bassist Reid Anderson, pianist Ethan Iverson and drummer David King — have been an indivisible front, welcoming the occasional guest but never a substitute, according to the strictest ideal of a working band. As the saying goes, it has always been larger than the sum of its parts.